Mercedes-Benz AMG GT vs Ferrari Roma

What's the difference?

The GT63 4Matic+ is a breathtaking example of everything that Mercedes-Benz and AMG are.

Ferociously fast, incredibly agile and superbly sophisticated, it should be on anybody’s shortlist, if that also includes a Porsche, Aston Martin, Maserati or even a Lamborghini. And it’s definitely much more than yesterday’s SLC ever was – for similar money in today’s terms, as it turns out.

But, around Tasmania’s glorious roads at least, the Mercedes-AMG lacks the ride comfort and road noise isolation to be a fully-rounded-out GT, and that’s a disappointment for a brand with such formidable history in making such cars.

The Ferrari Roma is like a trained assassin in a Zegna suit - capable and clinical yet stylish and effortlessly superior. We believe there’s a replacement coming later this year and it will have to be doing well to top this superb machine.

This is still clearly a Mercedes AMG GT coupe, like the 2014 C190 original, but a ground-up redesign sees it subtly yet significantly altered.

Some 270kg heavier than before, the larger-in-every-dimension body combines aluminium, steel, magnesium and fibre composite materials for improved rigidity and a lower centre of gravity. Length (4729mm) and wheelbase (2700mm) have been stretched by 177mm and 70mm respectively. Width (1984mm) and height (1352mm) are also up.

The nose treatment is similar to before, especially with the bulgy bonnet and signature vertical slatted grille fitted. These, combined with the LED digital headlight shape effect, is reminiscent of, but far-better executed than, the goofy-looking MG5’s face.

Underneath, it's an all-new platform shared with the SL, with the rear transaxle of the old car replaced by a permanent AWD system, leading from 46:54 front/rear weight distribution to 50:50 as a result.

That aggressive, exaggerated cab-backward/ultra-long bonnet silhouette that visually connected it with the SLS gives way to more-conventional and practical coupe proportions that is striking if not especially original, since they do look quite 911-esque. Along with the longer wheelbase and wider tracks, the result allows for two small rear seats to be fitted, while liftback cargo access remains.

Similarly, in the name of way-more usable interior packaging, Mercedes-AMG says it pushed the driving position nearly 180mm forward compared to the previous GT. Let’s see what that all looks like inside.

If you’re looking for a flash Fazza with spoilers and vents at all points of the body, you’ve come to the wrong coupe.

The Roma is a subtle, beautifully balanced and delicately detailed two-door inspired by all-time Ferrari classics like the 250 GT Lusso and 275 GTB.

Its proportions are impeccable with complex curves and sweeping lines combining to produce an exquisitely pure shape.

Slimline LED headlights are divided by horizontal DRL strips, the broad bonnet incorporates a quietly muscular power bulge and the minimalist ’egg crate’ grille sits below a sharply chiseled nose.  

I’m a particular fan of the split wedge-shaped tail-lights, seamlessly incorporated into the upper deck of the rounded rear end. The active rear spoiler is also neatly hidden away in the leading edge of the boot lid. No shoutiness here, even the exterior badges are works of art.

Crack open the bonnet and the engine sparkles like a jewel in a display case. Scarlet red crackle finish on the intake plenums and cam covers make it pop like a firecracker. 

The interior follows a dual cockpit theme with twin curved sections divided by a flying buttress style console between them housing the gear selection gate and central media screen.

Flashes of carbon-fibre and chromed alloy add a touch of overt raciness, Alcantara on the dash and doors echoes the ‘mouse fur’ of Ferraris past and the contrast stitching around the cabin is flawless. 

The sleek front seats feel as good as they look, the typography of the Roma badge on the passenger side of the dash is super cool, and overall the interior is snug and ultra classy. 

The first impression inside is that of space, despite the falling roofline and coupe-like upsweep of the side windows and you look back. While, again, similar to a 911s, a kink at the door gives the GT a unique character.

Even larger people will appreciate the generous amounts of room up front, with space to stretch, sat in sumptuously comfy bucket seats. Note that the standard ones are better than the racier but firmer Sports versions.

The driving position is perfect, ahead of a dashboard that is very typical modern Mercedes in appearance and layout.

To that end, the tablet-style integrated touchscreen (11.9 inches) is clear, fast and intuitive once time is taken to learn it. And points are also won for the multi-configurable electronic instrumentation, that allows for a variety of screens, including track, classic and minimalist views.

The trademark turbine air vents, the quite beautiful material and trim finishes and just the general solid feel are further typical contemporary Mercedes cabin treatments, as are the excellent ventilation and ample storage options.

And while rear vision isn't great, that's what cameras are for. It's all pretty much on brand.

It is a shame, given how elevated the Mercedes-AMG engineering is underneath, that the GT’s interior look and ambience is so similar to those of a (albeit higher-spec) C-Class or GLE. It's simply not as special as some of the company’s previous sports cars.

More annoyingly, the ride is too firm and bumpy for a GT, and this has the unhappy effect of provoking random rattly trim sounds within the cabin. It’s a bit like scrunched-up cellophane. In a $420K (as tested) Merc, that’s very disappointing, especially as it can be heard over the copious amount of road and tyre noise droning through, particularly on coarser bitumen surfaces.

Further back, the rear seat is strictly two-plus-two, and nobody over 150cm tall is recommended to travel there by Mercedes itself. That sloping roofline is the culprit. That said, brief trips with a bowed head are possible, as the fixed cushions and split-folding backrests are actually surprisingly comfy. But only for short journeys. Kids should love it though, and the second row does open up the GT’s usefulness enormously.

As does a near-doubling of the AMG’s cargo capacity, jumping 146 litres to 321L with backrests erect, to a whopping 675L (+325L) in two-seater mode. The flat floor is accessed via a large electrically-operated liftback door, offering quite a large aperture for easy loading/unloading.

Having no spare wheel helps here, with a tyre inflation kit included in lieu of that.

Meanwhile, at the front, under the bonnet, things have definitely changed for the better as well.

At close to 4.7m long, the Roma isn’t compact but its supercar stance comes courtesy of a close to 2.0m width and low-riding 1.3m height (with a 2670mm wheelbase).

The cabin is cozy, as intended, but at 183cm I still have ample headroom in the front. The rear is a different story with the two ‘+2’ seats serving as occasional emergency spots only or a handy option for smaller kids.

For storage there are slim but long pockets in the doors, a surprisingly generous glove box, a wireless charging pad under the centre console, phone-size slits on either side of that console, a single cupholder between the front seats with a lidded box (containing 12V and USB-A outlets) behind it.

There’s a recess for oddments on the transmission tunnel between the rear seats, and armrests either side in the back.

The boot holds 272 litres, which is enough for several soft bags, rising to 345 litres with the 50/50 split-folding rear seatbacks lowered. There are tie-down anchors, which is handy but be aware there’s no spare, only a repair/inflator kit.

Overall, not exactly SUV-like in terms of day-to-day practicality but at least on par with its key competitors.

At $453,000 before on-road costs, the Roma Coupe lines up almost directly with a trio of well-credentialled, well-equipped and ultra-fast 2+2 supercars - the Aston Martin DB12 ($455,000), Maserati GranTurismo Trofeo ($450,000) and Porsche 911 GT3 ($446,700). 

If you prefer a roofless experience, the Roma Spider convertible will set you back $520,300 (BOC).

And as you’d expect, the standard features list is impressive; the options list even more so.

Aside from the safety and performance tech covered a little later, highlights include 18-way power front seats, full-grain Frau leather trim, eight-speaker JBL audio (with digital radio), dual zone climate control, an 8.4-inch hi-definition central media display, a 16-inch (highly) configurable instrument cluster, adaptive cruise control and 20-inch forged alloy rims.

There’s also LED exterior lighting (including auto dusk-sensing headlights), Android Auto/Apple CarPlay connectivity, rain-sensing wipers and built-in nav, as well as Alcantara, chromed aluminium and carbon-fibre trim details. There’s more, but you get the idea.

And when it comes to options, the sky’s the limit with the likes of carbon-fibre everything, beefier audio as well as custom colour and trim options available through Ferrari’s ‘Tailor Made’ and ‘Special Equipment’ programs.

One popular addition is an 8.8-inch HD touchscreen for the front passenger (co-pilot?) displaying data on the car’s performance and status as well as allowing selection of music, sat-nav info and climate functions. Super cool and it will set you back $9500.

There’s a plaque signifying which engineer “handcrafted” the GT’s engine – in this case, the famous M177 in 3982cc, 4.0-litre twin-turbo intercooled V8 petrol guise.

Delivering 430kW of power at 6500rpm and 800Nm of torque from 2500-4500rpm, it sends drive to all four wheels via a nine-speed multi-clutch transmission (dubbed MCT in AMG-speak), catapulting the GT63 4Matic+ from 0-100km/h in just 3.2 seconds, on the way to a top speed of 315km/h.

How does it do that?

With AWD, the GT is now nearly 15 per cent heavier than before, but it still manages a punchy 218kW/tonne. Active aerodynamics over, inside and under a more-rigid body structure also helps.

The AMG 4Matic+ AWD system goes from 50/50 front/rear, to 100 per cent rear, variable torque distribution according to conditions and settings, and backed up by an electronic limited-slip differential. Among the many driving settings are Race Start, Drift Mode and good-old Comfort, if it all becomes too much.

Also keeping all that performance in check is a high-performance composite brake setup with improved cooling for faster responses.

Interlinked active roll bars improve body control, the five-link independent suspension features adaptive dampers for a softer ride.

And, as for that 4WS tech, the rear wheels steer opposite to the fronts at up to 100km/h (by some 2.5 degrees) for tighter and tidier handling, or 0.7 degrees in the same direction above 100, for greater stability and road-holding.

Its effect on the way this near-two-tonne coupe zigs and zags around corners is something you need to experience to really appreciate.

Enzo Ferrari famously said “aerodynamics are for people who can’t build engines” and notwithstanding the fact the Roma is slippery in the wind tunnel (Cd .30), its front-mid mounted 3.9-litre turbo-petrol V8 engine would surely meet with il Commendatore’s approval.

Sending drive to the rear wheels via an eight-speed dual-clutch auto transmission, this all-alloy, 90-degree unit features dual twin-scroll turbos, a flat plane crank, dry sump lubrication, direct fuel-injection and a single-piece cast exhaust manifold to produce 456kW from 5750rpm to the 7500rpm rev ceiling, and 760Nm from 3000-5750rpm.

Worth noting its 'front-mid' placement as the entire block is positioned low down and behind the front axle centre line.

Actually, the GT’s economy isn’t horrendous considering how fast it can go.

Even blasting a few times around beckoning country roads, we managed an indicated 13.0L/100km, which is an improvement on what Mercedes-AMG says the GT averages the 14.6L/100km average that Mercedes-AMG officially states.

That translates to a carbon dioxide emissions rating of 334g/km.

Using 98 RON premium unleaded petrol, an average of just under 480km between refills of the 70L tank is possible. The urban run sees consumption rocket to 21.8L/100km (for just 321km of range), or 10.4 out on the highway run, meaning that over 670km is possible should you decide to drive in a docile manner.

The Roma’s official (WLTP) fuel consumption figure on the combined (urban/extra-urban) cycle is 11.2L/100km, the 3.9-litre turbo-petrol V8 emitting 255g/km of CO2 in the process.

Not exactly miserly, but even with that engine begging to be revved we saw an average of 12.9L/100 over a combination of urban shuffling, twisting B-roads and some freeway running.

A start/stop function is standard and with an 80-litre fuel tank on board, the Roma’s theoretical range is around 715km, dropping to approximately 620km using our real-world number.

Nobody will drive the GT63 4Matic+ and think, ‘Oh, this is OK’, because its breadth of performance is phenomenal.

No matter which mode you're in, from Comfort through to track-tuned Race, the Mercedes-AMG blends forceful pace and commanding control without ever breaking a sweat.

Flex your right foot and the two-tonne coupe bounds into action like a giant on a mission, striding past posted speed limit signs in nanoseconds and way, way faster than the law will stand if diligence isn’t exercised.

And there’s no point relying on seat-of-your-pants sensations, either, because the chassis below embraces the road with an almost zealous devotion. Which is astounding, given how agile the four-wheel steering-enhanced handling is.

The 63’s super power is exactly that – it dulls your sense of speed. One tester admitted to exceeding 150km/h before noticing. An odd confession considering the sonic boombox that is the bi-turbo V8’s howl.

But jailbait performance is not even the 63’s most lingering joy. That would be its steering perfection, that delivers that rare trifecta of keenness, crispness and communication. The wheel feels eager and alive in your hands, even when powering between tight turns, backed up by sensational grip and control. How can a two-tonne GT handle so sharply?

Warm, dry roads were the order of the day, so we can’t tell you how the 4Matic+ permanent AWD system deals with wet or slippery surfaces, but the slick multi-clutch transmission, seamless torque-vectoring tech and sticky tyres more than cope with the 63’s formidable outputs.

So, that's the gushing part out the way, then.

Despite the adaptive dampers, rigid architecture and exquisitely sophisticated suspension, the ride is simply too stiff in Comfort mode, and downright jittery on some of the Tasmanian roads we tested on, for the 63 to be considered a true luxury grand tourer. It just isn't comfortable, luxurious or supple enough.

Plus, grippy as they are, the 21-inch wheels transmit too much road and tyre noise through to the cabin, meaning that the GT isn't as quiet as you'd hope. Add the aforementioned trim squeaks, and the expected cocooned silence isn’t always there.

The upshot is that the 63 possesses more of a sports car character than a luxury GT character. Great news if you're a 911 type buyer and are seeking a high-performance 2+2 alternative, but a disappointment if comfort and refinement are priorities.

Still, it is impossible not to be deeply moved by this Mercedes-AMG.

Press the PS (Partenza Sportiva) button on the console, slip the manettino control on the steering wheel into ‘Race’ mode, left-foot brake (hard) and floor the throttle. Wait for the PS light on the dash, keep the accelerator pinned and lift off the brake.

Ferrari says the Roma will then proceed to accelerate from zero to 100km/h in 3.4 seconds, and in the interests of a thorough assessment I may have found a quiet light commercial area near Maranello, replicated this procedure and validated the claim.

Yes, even at 1570kg, with 760Nm of pulling power available from 3000-5750rpm, the Roma is exceptionally fast in a straight line. And the twin-turbo V8 that’s been so reserved and docile around town lights up to deliver glorious engine noise and a characteristic exhaust howl.

A flat-plane crank arrangement often makes a vee engine lumpier than a more conventional cross-plane design, but it will rev hard and fast, and in this case the compact size of the Roma’s twin turbos enhances throttle response even further.

Speaking of the turbos, variable boost management helps to smooth acceleration while keeping an eye on fuel economy and despite the flat-plane configuration this engine is perfectly civilised.

A tall top (eighth) gear makes for easy cruising but the tight B-roads and lesser highways we spent most time on didn’t allow for any high autostrada speeds.

But how’s this for a flex? Ferrari says the active rear spoiler will stay in its low-drag position until the car hits 100km/h, then pushing through medium and high drag (135-degree) positions as speed rises. But… “over 300 km/h, the spoiler is always in MD mode because in such conditions it is preferable to have a more balanced car”.

Suspension is by double wishbones at the front with a multi-link set-up at the rear and twin solenoid (magnetic) adaptive dampers all around.

Rubber wrapping the 20-inch forged alloys is top-end Michelin Pilot Sport 4 S (245/35 fr / 285/35 rr) and front-to-rear weight distribution is 50/50.

What that all adds up to is a comfortable, responsive and deeply satisfying drive experience. In standard Ferrari fashion the dual-clutch transmission is rapid-fire perfection, the steering is light but accurate and feelsome, while the in-cabin ergonomics are superb.

Push as hard as you dare in tight, flowing corners and the car just continues to grip and bait you to try harder. And if you do give in and start to run out of talent the ‘Active Yaw Control’ and limited-slip ’E-diff’ will step in to imperceptibly save your bacon.

Moving the manettino through its five positions - ‘Wet’, ‘Comfort’, ‘Sport’, ‘Race’ & ‘ESC-Off’ rapidly transforms levels of ride comfort, steering, transmission and engine response. You can also set the ride to Comfort with other attributes dialled up to 11 for a cross-country sweet spot. 

And when it comes to slowing rather than going, the Brembo brake set-up is circuit ready with vented carbon ceramic rotors all around (390mm fr / 360mm rr) clamped by six-piston calipers at the front and four-piston units at the rear. They take a while to warm up, but never feel anything other than mega. 

No surprise, ANCAP and Euro NCAP have not assessed the Roma, but you could mount a solid case that the car’s high-level dynamic ability is its greatest active (crash avoidance) safety system. 

Over and above that there are the usual anti-lock brake, traction and stability control systems (the latter is Ferrari’s adjustable SSC ‘Side Slip Control’) as well as AEB (with vehicle and cyclist detection), adaptive cruise control, lane-keeping assist, lane departure warning, blind-spot monitoring and traffic sign recognition plus front and rear parking sensors.

Also worth calling out ‘FDE’ (Ferrari Dynamic Enhancer) which works in parallel with the SSC to help modulate lateral movement in extreme circumstances.

If a crash is unavoidable there are four airbags - dual front and dual side front (head). That’s an acceptable count in a 2+2 coupe, but it would be nice to see a front centre bag.

What’s the GT like to own?

Mercedes-Benz offers a five-year/unlimited km warranty, with five years of roadside assistance. This is average for most mainstream and luxury brands, but superior to most sports-car makers like Porsche and Lamborghini.

Intervals are every 12 months or 20,000km, and while no capped-priced servicing is offered on the GT, pre-paid three-, four- or five-year service plans are available, ranging from $5165, $7700 and $8665 respectively.

Big performance demands big maintenance bills, it seems.

As the name implies, Ferrari’s ‘7-Year Genuine Maintenance’ program means you won’t have to worry about servicing costs for the first seven years of ownership. Everything from labour and parts to lubricants and brake fluid is included in the free-of-charge package.

For reference, maintenance is recommended every 12 months/20,000km, which is a healthy distance and roadside assistance is complimentary for the first 12 months. 

Warranty cover is three years/unlimited kilometres, which trails the mainstream market but matches high-end competitors like Aston Martin, Lamborghini, McLaren and Porsche.