Mercedes-Benz SL-Class vs Bentley Continental

What's the difference?

The SL's overall score is somewhat skewed by everyday concerns, and rules are rules - an average punter will find the price of this car somewhat confusing and the devil-may-care attitude to fuel consumption bewildering.

If neither of these things are a problem, then the SL63 makes plenty of - well, not sense, because it's not a particularly clever or considered car - but it fills a niche that not so long ago we all thought would go the way of the dodo.

The fact it sells so few examples is betrayed by some of the cabin amenities and the fact that Mercedes hasn't put much effort into reducing the car's weight to improve its consumption or sharpen up the handling.

The fact it still exists at all is pretty damn cool, though, and for certain people an SL63 purchase is the culmination of a lot of hard work.

If it is your dream car, the SL63 won't disappoint. Everyone who rode with me said it was mightily impressive, but you've got to really want it. When you're not far off buying a Ferrari California T or Aston Martin V12 Vantage S for the money, you'll need a real yearning for the three-pointed star to go this way. And if you do, good luck to you - you've probably worked quite hard to get here.

Any fears Bentley was heading in the wrong direction by abandoning 12 cylinders for hybridisation (not that it had a lot of choice) should be totally salved by the Continental GT Speed. It is a hugely capable, fabulously luxurious and beautiful to behold grand tourer that deserves extra points for not being an SUV. It might just be the supercar you could drive every day, with no complaints.

Note: CarsGuide attended this event as a guest of the manufacturer, with travel, accommodation and meals provided.

The SL has always been completely unapologetic about its size and seems to be designed to accentuate rather than hide its length and width. The long bonnet screams power and prestige, and get out of my way, and is reminiscent of the little-loved McLaren SLR project of some years ago.

The size of the Mercedes logo on the huge front grille leaves you in little doubt about the brand of car that’s about to pass you at speed and some might say (okay, I would) that its large surface area is a little vulgar.

Like the SLR, the design doesn't seem to have a particularly cohesive strategy, with a number of Mercedes elements from around the traps that climb over each other. Roof up it looks awkward because of the gigantic posterior while with the roof down it looks overly long and, again, tail-heavy.

Folding hardtops are notoriously cumbersome and need a lot of room to hide them, but the silent operation is something to behold.

Elements that are worth deleting if possible are the dodgy 'Biturbo' badges. It's that kind of bling that gets people raising their little finger at you.

I don’t think I’ve ever heard so much interesting waffle about the design of any car, ever, but before we get to the wild, and wildlife, justifications for how it looks, just feast your eyes on it. 

Now, not everyone might love it, but it’s hard to imagine a huge, super coupe looking any better than this thing does. It’s no Ferrari, sure, but realistically it doesn’t have to compete with that, because it’s a cruiser as well as a bruiser, a supercar you can be quiet and comfortable in. A Rolls-Royce with rocket engines, even. 

The most obvious change, of course, is that Bentleys have had four headlights, or four eyes if you like, for so long that seeing this new one with two is a major shock, a big shift, but somehow it works.

The proportions, the elegance, the bold 'be big and bold and give no damns what anyone thinks', it’s just impressive, and the interior reflects that same, luxury ethos.

Apparently the new-look Continental is built on three design principles, the first of which is, amusingly, 'Resting Beast'. This is supposed to reflect how the Bentley looks from side on; like a tiger, stalking its prey, or perhaps resting and thinking about its prey. It’s all muscles and strength and power, but also elegance. And who doesn’t imagine tigers walking red carpets in ball gowns?

Principle two is 'Upright Elegance', and here you’re supposed to see, in the car, the strong vertical line one finds in the chest of a thoroughbred horse when it’s standing in particularly powerful way. Great. Love it.

And finally, there is the 'Endless Bonnet', which is a horizontal line that goes from the front of the car - via the bonnet obviously - and all the way to there rear, via cat-like haunches, providing an impression of “speed, even when standing still”.

Those are the bold strokes, but it’s all the little details that make it sing, like the beautiful jewellery-like look of the headlights, which are meant to resemble a tiger’s eyes. So many cats, is it any wonder I started thinking of the Bentley as a very, very flashy Jaguar?

It’s important to note that while it looks very new - and 68 per cent of the Continental’s parts are new - the body panels are carried over, while the front and rear are all new. This is one very effective mid-life facelift, with a heart transplant, then.

“Practicality” is about as relevant to this car as a code of ethics is to a drug dealer or a contract killer, because the SL63 buyer is hardly worried about cupholders and boot space. For what it's worth, there are four cupholders in the two-seater cabin (which might explain why owners aren't worried about their liquid carrying prospects) and a minimum boot space of 364 litres and a maximum - with roof up - of 504, which is actually not bad.

Cleverly, there's a little robot-operated luggage cover inside the deep boot that stops your gear from being crushed when the roof goes down.

There's also space in the long doors where you might secrete a bottle of wine that would get a NSW Premier fired if he thanks you for it, and a bin in the console to hide your phone.

So a two-door, '2+2' grand tourer isn’t entirely built with the term 'practicality' in mind and it could be argued the existence of this Bentley Continental, the fourth generation, is something of a surprise, when you consider most people just buy SUVs and Bentley has done quite well with its Bentayga (which will, in future, share the same engine used here).

But for what it is, a two-seat car with occasional seating in the rear for emergencies, or very small children, it feels entirely fit for purpose.

An actual human can sit in the back, but it does feel a bit claustrophobic, and you’d be so jealous of how comfortable the people are in the front.

The 20-way adjustable front pews feel like grand armchairs for grand touring, fabulously comfortable - although you can slide across them a bit when driving on a race track, not a common problem - and plush to the touch.

They now come with a 'Wellness Facility' that brings postural, massage and climate functions to help with fatigue on long journeys - and epic blasts across multiple European countries is clearly what this thing is designed for.

In general, the cabin is just lovely, Bentley claims it does the best car interiors in the world and while Rolls might argue, it’s a pretty fair statement.

The spinning central 12.3-inch display remains the highlight, offering you a modern touchscreen, which can disappear to reveal either three classic analogue dials or a plain piece of dashboard, if you prefer a 'digital detox'.

As always, value becomes a nebulous term once the price of a car surges into the multiple hundreds of thousands. The Bentley Continental GT Speed will set Australian buyers back a whopping $581,900, before on-road costs.

Yes, you really can buy Ferraris and Lamborghinis for that kind of money, but Bentley assures us its buyers have already owned such fearsome machines, grown tired of their compromises and want something that’s just as fast, but 1000 times more comfortable, and easier to drive every day, and everywhere.

So that’s where the value proposition sits, basically. You’re buying a supercar that’s also a kind of Rolls-Royce adjacent luxury cruiser. Two cars for one price. Bargain. Kind of. It also weight 2.5 tonnes, if you’d like to think of it in dollars per kilogram.

Oh, and it’s hand made, too, and genuinely feels like it.

For that money you get an incredibly posh and plush cabin, excellent seats, and everything you touch, and smell, seems expensive and refined.

The newly facelifted, and butt-lifted, Continental also looks simply stunning, from every angle, outside. Particularly in its new 'Tourmaline Green' paint (there are 18 standard colours to choose from, or you can have bespoke paint made for you on request). And 15 standard leather hide colours as well.

It comes with all the apps and connectivity you could wish for, including a Bentley App Studio.

The SL63 is powered by Mercedes’ increasingly famous V8, with two turbos along for the ride to add oomph and cut the car's famous consumption, at least slightly. The 5.5-litre unit produces a massive 430kW and a scarcely believable 900Nm of torque.

All of that heads rearward via a seven-speed dual-clutch transmission that helps sling the 4.6m, 1848kg machine to 100km/h in 4.1 seconds.

There is some sadness that the world’s biggest producer and promoter of 12-cylinder engines has cut production of them altogether - the epic W12 is no more - and this does feel, on a smaller scale, like Porsche ditching flat-six engines forever.

Previous hybrid efforts from Bentley, including a V6-based one that the company now admits was a bit limp wristed, might cause some concern when you hear that Bentley will, henceforth, make just one engine for all its cars, and that it is a hybrid, albeit one attached to a 4.0-litre twin-turbo V8.

But then they point out the version in this Continental GT Speed’s is “the most powerful Bentley engine ever” and that sounds pretty good.

The engine alone makes 441kW and 800Nm, which almost sounds ample, but the addition of the electric E-motor is good for another 140kW and 450Nm, with the aid of a 29.5kWh battery, which somehow adds up to a combined output of 575kW and a nice, round, and impressive 1000Nm of torque.

All that power does have to move 2.5 tonnes of precious metal, which sounds like an ask, but is effortless in practice - hurling the Speed to 100km/h in a properly supercar-like 3.2 seconds on its way to a top speed of 335km/h.

Yes, vitally, it sounds pretty damn impressive when all the power sources are going at once, it even barks and pops on the overrun, a bit like the Porsche Panamera with which it shares the hybrid set-up, only a bit bossier, and perhaps classier.

The point of the hybrid feels like it’s mostly about performance and excitement, but it has a practical side, too, because in EV-only mode this giant Bentley can drive for up to 81km in pure, and slightly inappropriate-feeling, silence (at speeds of up to 140km/h).

Handy if you live in global cities with zero-emission zones, or if you want your neighbours to think you care about the climate.

One brilliant thing about this plug-in hybrid is it’s set up to use the engine to regen the battery, hard, in 'Sport' mode, so the more fun you have, the quicker the battery charges. So much so that, realistically, you might never need to plug it in at all (Bentley recently ran the car at a race track for two weeks and never needed to top it up via cable once).

It is an impressive, sonorous and enjoyable power plant, and you’d expect nothing less from Porsche, although Bentley says it’s done lots of work on the donor engine to make it uniquely more wonderful.

Much as is the case with the price, there's no real way to soften the blow here - the SL63 drinks like a footballer on Mad Monday, except it does it every day. The official combined cycle figure of 10.2L/100km is quite easy to double, as we did, averaging 21L/100km in mostly flowing suburban traffic. In the car’s defence, the accelerator pedal spent a good deal of time near the firewall.

The SL does have stop-start to help reduce its considerable environmental impact.

While the top-line figures for performance hybrids like this always sound impressive, it’s hard to believe anyone will ever get near them in the real world, because the temptation to drive a car like this hard and fast, as its makers clearly intended, will mean chewing fuel in a very non-efficient way indeed.

On paper, though, where it matters in terms of being allowed to sell your giant luxury grand tourer in Europe, the Bentley Continental GT Speed produces just 29 grams of CO2 per kilometre. 

Fuel economy is a claimed 10.3 litres per 100km, which is optimistic, but still a lot lower than the equally unlikely 14L/100km figure for the old (12-cylinders and no hybrid) car. As in, neither car would ever achieve the theoretical figure, but at least the new one is clearly a lot better.

There are a number of impressive things about the way the SL drives. Firstly, astronauts will be familiar with the galactic thrust of the V8. It seems endless, seamless and ready to sling the big coupe into the outer atmosphere. Few engines of any kind can match the relentless go on offer in the SL and much of the credit should go to the seven-speed twin-clutch transmission.

When you jump on the brakes and shift down, the exhaust keeps the show going with angry crackles and pops.

Containing a torque figure like the twin-turbo V8's requires a lot of electro-trickery to stop you from being launched off the road. The great thing about all that stuff is that it works unobtrusively and smoothly.

Mashing the carpet in an SL without traction control would create much sound and smoke but little forward progress, such is the twist on tap. The SL has a range of modes from full-nanny (which is meant to keep you on the slippery Alpine road you've chosen to get you to some Swiss ski resort) while turning the dial all the way around to Race loosens the bonds.

It's in this mode you'll have the most fun and it does seem that the intermediate settings are a bit of a waste of time. Race mode does little to diminish the amazing ride quality provided by the active suspension setup, but relaxes the reins on the huge rear tyres. Exiting roundabouts is suddenly a huge laugh, with the tail cheerfully breaking traction and the two-mode exhaust thundering in a most pleasant way.

Better still is that when you jump on the brakes and shift down, the exhaust keeps the show going with angry crackles and pops, with more on the way when you lift off. There's little to match the aural pleasures of a properly tuned V8 and Mercedes has resisted the temptation to quieten it down on the outside and generate a fake noise for the inside. Although that would be stupid in a convertible, if you think about it.

The SL63, despite its AMG badge, isn't about all-out handling, of course. The Ferrari California would definitely show it how it’s done on a winding country road. The SL is more about flow, building momentum and rarely shifting down to second gear. The monstrous torque is enough to keep things rolling but should you wish for a bit more of the exhaust bellow, second is there for the taking.

Hustling the big convertible feels wrong, not because it can't do it, but because it's not really what it's for. Having said that, it offers a kind of fun that nothing else on Earth will provide, not even a Bentley GTC.

With the roof up, the SL63 is a quiet place but not remarkably so. The huge sticky tyres do the cabin's hush no favours, with an annoying roar on a wider range of surfaces than you might expect.

Roof down, it's hardly a paragon of virtue. A lot of wind noise reaches the cabin, even well below the huge speeds the SL can reach. So if you want to talk, it's windows up you'll need to deploy the mesh screen that bridges the roll hoops.

In an ideal world, one would take the Bentley Continental GT Speed for an appropriate drive from the top of Germany to the bottom of Italy or France, but instead we were asked to drive the big beast around a tight and slightly terrifying private members race track outside Tokyo called the Magarigawa Club.

Members here pay US$1 million a year for access to this circuit, carved out of several mountain tops, which features two long and fun straights attached to what feels like a hill climb circuit with a bit of Laguna Seca’s Corkscrew and a touch of Mt Panorama’s undulations.

This track, with its daunting lack of run-off, should have been an intimidating and possibly inappropriate place to try the Continental GT Speed, but it is a credit to the car’s “everyday supercar” personality that it soaked up the pressure, and pace with ease.

On our first lap we were encouraged to drive in EV mode, which was predictably a bit dull, quiet and not-quite boring, because if you went past 75 per cent of throttle, or 140km/h, the engine would kick in and things would instantly get interesting.

It was a good chance to note just how lushly comfortable the cabin and seats are, however, and just how supple the suspension can be.

The Bentley’s “secret weapon”, according to its engineers, is a new twin-valve damper the allows the chassis to behave like a sports car when you want it to - probably about 3.0 per cent of the time for actual owners - and an absolute luxury pleasure palace for cruising around the rest of the time.

The split personality thing really is on offer with this car, as we found out once we engaged the Sport setting.

The Speed’s all-wheel drive, all-wheel steering, torque vectoring and electronic LSD were all on display over the later laps, in which we were allowed to blast past 200km/h and find out just how good the brakes are at pulling up 2.5 tonnes of high-speed luxo-barge.

You do your steering via a lovely wheel with a leather front and Alcantara wheel, and it feels effortless, even in full track attack mode. A bit more feedback might be nice, but I guess Bentley owners have other cars for that kind of thing.

Aside from the rushing, roaring speed, what is most impressive is how little body roll there is from the Continental. It feels planted, poised, happy to change direction and is rarely upset or flustered, despite some squeals of complaints from the tyres. 

Getting too wide on to the ripple strips caused a shudder and a skip sideways now and then, but perhaps I shouldn’t have been so far off the racing line.

Overall, the Continental GT delivers on its name, with Speed, and lots of it, all delivered in a properly swanky environment.

All the money and you only get four airbags; front and side for driver and passenger. And none in the back, so don't sit there. Bentley also has its own 'Safeguard' suite of technologies including 'Advanced Emergency Braking', 'Swerve Assist' and 'Turn Assist'. 

Other tech includes 'Predictive Adaptive Cruise Assist with Lane Guidance', 'Lane Departure Warning', 'Emergency Assist', 'Remote Park Assist' and '3D Surround View'.

The SL63 is covered by Mercedes' three-year/unlimited kilometre warranty. And, er, that's it.

The Bentley Continental GT Speed comes with a five-year, all-inclusive servicing plan as standard.

That sounds good, but stunningly, Bentley still only offers a three-year manufacturer warranty, albeit one with no mileage limitations. That's way below industry standard these days.

The battery that forms part of the hybrid system is, however, warrantied for eight years, or 160,000km.