Maserati Granturismo vs Mercedes-Benz AMG GT

What's the difference?

From the most compelling engine sound this side of … well, anything … to a timeless, shapely body the GranTurismo is a surprising car. While its age is catching up to it in a few areas (fuel consumption, in-car entertainment) what matters most is that this Maserati still lights the fire in the belly.

This is no Lotus, but damn if it ain't a hell of a good time, and proof positive that electrification can enhance the V8 experience, rather than ruin it.

As has already been (indelicately) mentioned, this is a design that is not only ageing well, it still looks pretty fresh from most angles. The only let down are the over-sized tail-lights that look more at home on something less exotic. Those aside, it's a deeply pretty car, with lovely surfacing, the highlight being those beautiful rising guards that funnel your vision down the bonnet.

Interior packaging isn't the GT’s strong point. Inside is pretty cosy with a fat transmission tunnel that makes for a narrow footwell.

With the Sport you get carbon-backed seats that are thinner in the backrest allowing for more room in the tight rear bucket. Snug they may be, but head and leg room is surprisingly good. The white leather interior of this one may not have been to everyone’s taste, but it was certainly beautifully put together.

The boot is fairly small but will fit more than, say, the similarly sized (but double the price) Ferrari FF.

It's a mean, but somehow still sleek, looking beast, this big AMG, but it's also immediately recognisable as a thing of intent.

Up front, there's the huge vertical-slat grille that looks like it drove straight out of a Stephen King novel, a massively domed bonnet, and these vacuum-like side intakes that look like they could suck in stray animals.

Then, at the back, there are twin dual-pipe exits (for four in total), and an automatic wing that pops out of the rear bodywork. And all of that's capped off with these massive 21-inch forged alloy wheels hiding golden ceramic-composite brakes.

Mean, yes, but not quite as aggressive as you might expect the most powerful AMG to date to come across, perhaps.

Inside, it's more subdued again, with the AMG presenting a pretty passenger-friendly space, with all the Benz tech you'd imagine, including the massive screens, and — thanks to its air suspension and drive modes — the ability to tailor the ride to your liking, meaning a comfortable and premium experience, despite the power under your right foot.

There's no escaping the fact that a big number has been applied this AMG E Performance model in Australia, with the GT63S commanding $399,900, before on-road costs, and before you start selecting option packs.

Obviously performance is what you're really paying for here, but there are lots of niceties included, too.

They include an electric glass sunroof, 21-inch forged-alloy wheels with ceramic composite brakes, rear-axle steering, puddle lighting, power-closing doors (only sealing, not full hands-off closing), LED lighting, and an auto rear wing that retracts back into the body work at the rear.

Inside, there are twin 12.3-inch screens with Apple CarPlay and Android Auto, a Burmester sound system, Nappa leather seats front and back (which are heated and cooled in the front, and which offer a massage function), and three-zone climate control.

You can then spring for the 'AMG Night Package' ($3490) which adds the 'AMG Night Exterior Package', different 21-inch wheels in matt black, dark tints on the rear glass, black badging and dark chrome on the grille.

Then there's the considerably more expensive 'AMG Carbon Fibre Package' ($18,490), which gives you the carbon exterior package, carbon inserts in the side skirts, and more carbon on the front wing trim, the mirror housings, the rear wing (which is now fixed) and in the cabin.

There is more, of course, but we'll get to them under our performance, driving and safety sections.

Maserati's 4.7L V8, inherited from the then-parent Ferrari, is a cracker. Based on the V8 found in the F430, it has a gloriously silly redline of 8000rpm. Peak power is 338kW at 7000rpm and 520Nm at 4750rpm.

The 0-100km/h is dispatched in 4.8 seconds and top speed is 298km/h.

The transmission is a six-speed ZF automatic and fuel economy is a sobering 14.3L/100km on the combined cycle.

It's not just what's under the bonnet, but what's at the rear axle, too.

But let's start at the front, shall we? Here, a familiar twin-turbo V8 engine lurks, producing a potent 470kW and 900Nm, which is fed through a nine-speed automatic, complete with paddle shifters and several drive modes, including the traction-limiting 'Race'.

But that is then joined at the rear by an electric motor with its own two-speed transmission, and which produces 70kW and 320Nm – or up to 150kW for 10-second blasts under heavy acceleration.

Combine both, and you're tapping into around 620kW and in excess of 1000Nm, enabling a sprint to 100km/h in just 2.9 seconds, and a flying top speed of 316km/h.

There are few more impressive sounds in the automotive world than a Maserati-tuned V8. Even on start-up, the smooth V8 gives you a little bellow to wake the neighbours and when in non-Sport mode it quickly settles into a quiet idle. The exhaust has the now-familiar valving that opens up when you switch it into Sport and if you don’t default to that when driving the GT, you're probably dead inside.

The V8 makes a tremendously addictive racket, getting better with every rev as the tacho needle swipes right to the redline.

When compared with the lightweight sportster from which the engine is lifted, you won't be moving quite as quickly, but the noise and the sharp-shifting transmission will keep you happy. Tunnels are worth the price of entry as you crank the windows down and flip the paddles to find second or even first.

It's hard to pick that the transmission is a traditional automatic. The shifts are fast and positive but never violent – that would be out of character – responding properly to the paddles. In automatic, it's smooth and gentle.

The steering is mighty impressive too. There's enough feel to keep you interested and entertained but not so much you’ll be overwhelmed in the daily drive. The nose changes direction with a flick of the wrists and the moderately-firm Skyhook suspension does a good job of making the rest of the car follow without undue body roll.

Despite rolling on 20-inch alloys shod with sticky 245s up front and 285 at the rear, cruising in the GT is surprisingly quiet and comfortable. WithSport mode off, it's a very agreeable place to be. The seats are hugely comfortable, even in the rear, which seems impossible.

There's a lot of big numbers surrounding the Mercedes-AMG GT63S E Performance, but let me throw another one at you – 245km/h.

That was the high score I saw pop up on its digital speedo as the big and electrified Mercedes flew down the main straight at Sydney Motorsport Park (formerly Eastern Creek), before my courage ran out and my foot found the brake.

That kind of velocity is mind-bending in a vehicle this big, and so is the way that power is delivered, with the AMG's big brain deciding how and when to maximise power from the engine and electric motor to deliver a constant surge of torque that shoves you back, and the GT63S E Performance into the future.

But big acceleration is hardly surprising with that much power. What is a little more impressive is how easy this four-door supercar is to wrestle around a racetrack.

Sure, the feeling-out process is a little more involved, as you figure out how and when you'll feel the weight shifting, and as your brain struggles to compute how what's happening is even possible, but after a couple of laps the AMG settles into an easy, flowing rhythm that, while never feeling light on its feet, also doesn't feels like you're piloting a bus.

At least part of that is down to the wizardry on board, like the 'AMG Air Suspension', the rear-axle steering and the limited-slip diff, all of which combine to make the GT63S feel tighter and sharper than it would otherwise.

But it's also partly down to the prodigious power on offer – perfect corner entry and exits are less relevant when you have a cruise missile strapped to your right foot that doesn't just quickly make up for any driver errors, but shrinks the space between corners to the blink of an eye.

Yes, it's heavy, and there isn't much that's pure about the go-fast experience, but it left an ear-to-ear grin on my face, and isn't that priority one for any new AMG?

How does it drive on the road? That I don't know, as this was a track-only drive day. But we will get one on a proper test soon and let you know.

The GT63S E Performance is yet to be crash-tested (probably something about each one costing about the same as small apartment), but it does come pretty comprehensively loaded with safety kit.

That includes the standard 'Driving Assistance Package Plus', which delivers active cruise control, AEB, 'Active Steering Assist', 'Active Lane Change Assist' and nine airbags.