Mercedes-Benz S300 vs Lexus RC300

What's the difference?

The 2018 Mercedes-Benz S-Class remains a technological tour de force, a luxury sedan to be reckoned with - one that has safety, technology, comfort, finesse and performance all rolled into a stylish package. 

It's hard to see why you'd need anything more than the S 350 d, which is now much more attractively priced. It'd be my pick, but I'd have to get the Energizing Comfort Control package, and probably the AMG styling pack, too. And even then it would cost less than its predecessor.

Still a rock-solid option in the (admittedly not massive) premium-coupe space, the Lexus RC looks and feels like a quality product. The 2018 update has addressed any safety shortcomings, even if the interior technology still feels a touch behind the times.

But an out-and-out performance car this ain't. Even in cars fitted with the big V8 engine, the RC behaves more like an effortless grand tourer than it does a performance coupe. But if we're being really honest with each other, that only serves to make it much easier to live with.

I swear it has been facelifted, and the changes are bigger than they might appear. There is no doubt that the S-Class shape is largely unchanged, but the German company has kept the modifications minimal in the scheme of things.

That doesn’t mean those changes are unnecessary, though. The new headlights, for example, are standard on every model, and are constructed with 84 LEDs (including three for the daytime running lights), and of course they’re adaptive with automated high-beam - meaning they’ll shield other road users from the glare of the lights at night. And the lights themselves will throw a main beam up to 650 metres, according to the company. 

Other things are slightly more cosmetic, like the revised three-bar grille treatment, new front and rear bumper designs that feature broader sculpted sections to widen the stance of the car, and there are new LED tail-lights as well.

The smallest set of wheels used to consist of 18-inch rims, but now the base car rolls on 19s, while the rest of the expansive range sits on 20s. 

The inside has seen some changes, too, but the appearance of things in the cabin isn’t the focal point - its the usability of the technology that's the big change. 

Oh, but I should tell you there are now 64 ambient lighting colours to choose from, which is up from seven, and now you can also set the lighting in three different zones - so theoretically you can have blue, orange and green areas of the cockpit, if you’re gross.

Yes, yes - eye of the beholder and all that business. But for mine, the RC looks terrific. We cycled through two models, the RC350 and the performance-focused F Sport, and both cut a fine and athletic figure on the road.

Front on, the pincered grille dominates the view, sweeping back into bonnet, and stretching to the lowest corners of the front end, while a flared-lip body kit runs the length of the body. Special mention also goes to the cat-claw swipes that live behind the rear wheels.

The regular RC models make do with twin exhaust tips, while the F Sport range scores quad pipes, separated by a slinky rear diffuser, and the rear spoiler is an integrated lip that forms part of the boot. Cooler still, the Carbon Edition adds lightweight elements, like a carbon-fibre roof panel and an active rear wing - with about 6.6kg shaved off the kerb weight.

Climb inside, and you'll find a quality - if slightly dated interior - with soft leather seats, carbon-effect trim elements and a new, 10.3-inch screen in the centre of the dash.

As you can see from our interior photos, though, some elements do now feel a little behind the times. The door panels feel harder than I'd like, almost as if a thin-piece of leather has been stretched over hard plastic, and the control unit in the middle of the cabin is awash with hard black plastic, and the knobs mounted on it feel a touch cheap and non-premium, too.

If you’re buying a Mercedes-Benz S-Class there’s a good chance you’re more interested in the back seat than the front: you could be buying it for a business, or you could like to be driven around - and there are definitely worse places you could be.

We would suggest, though, that the best place you could be if that’s your caper is in the back of a long-wheelbase S-Class model, which has extra legroom. 

And if you happen to be in a LWB model with the 'Business Class Package', you’ll enjoy two individual rear seats rather than a three-seat bench, folding tables for your bento box or laptop, and an ‘executive seat’ on the passenger side that features a foot rest and allows you to slide the front seat forward to liberate more room. Deluxe. 

No matter if you are in one of the stretched models demarcated as such by the ‘L’ suffix or not, you will enjoy excellent seat comfort and good head- and shoulder-room. Legroom in the regular models isn’t as plentiful as you might expect: much more affordable cars like the Hyundai Sonata give the S-Class a run for its money in that regard.

There are good storage options for odds and ends, with the back seat featuring a fold-down armrest with pop-out cupholders and a storage box, as well as map pockets - and the boot space varies depending on the model, but the S 350 d has a 510-litre cargo capacity (VDA). All four doors have bottle holsters, and a bit of extra room besides. Of course there are rear-seat air-vents, and if you’re kids are lucky enough to ride around in a S-Class, the two ISOFIX/three top-tether points will be welcome.

Up front there are two cupholders between the seats, and a new wireless phone charger in the centre console (Qi compatible phones only). There are two USB ports as standard in most models, while models with the rear seat entertainment package fitted get rear USBs. 

The huge screen that runs across two-thirds of the dashboard has seen the noticeable join marker removed for this update, with the monitors being upgraded to a higher resolution and the graphics have been reworked, too. The codpiece-style controller of the Comand media interface remains, and while it still isn’t as simple as other controllers, it is reasonably easy to get used to. 

So … what about Beyonce? 

She comes in as part of the Energizing Comfort Control system, which is standard in some models and a $1400 option in those that don’t have it fitted. 

Essentially it allows you to choose between different set moods: 'Joy', 'Freshness', 'Vitality', 'Warmth', 'Comfort' and 'Training', the latter of which offers three different stretching/exercise programs that last for 10 minutes to stop fatigue. The instructions are given by voice over the sound system.

Each of the moods will adjust the temperature and ventilation (the Freshness setting offers ‘gusts’ of fresh air as if you’re at the beach!), ambient lighting, air fragrance and intensity, and the massage function for the seats. And the music bit - there are predefined songs the system can cue up to suit the mood, or it can identify songs on a hard-drive or USB that suit the programs by analysing the tempo of the tune. Amazing, right?

The new steering wheel looks a lot sportier than the one in the pre-update car, and it has finally done away with the awkward cruise control stalk in favour of steering wheel buttons for the adaptive cruise control system.

Now look, if you see a future filled with trips to Bunnings or ferrying the troops to soccer training, the RC is not for you. It's a two-door, four-seat coupe - and those two rear seats couldn't be less helpful for adult-sized humans if they'd been painted on.

Its dimensions measure 4695mm in length, 1840mm in width and 1395mm in height, but most of that space is focused on the front-seat riders, where your surrounds feel sporty-snug, but not claustrophobic.

Up front, that cursed mousepad control system is still in full flight, but the screen it controls is now bigger. There are two cupholders to be shared between front-seat folks, as well as the usual compliment of USB and 'aux' connections. And even a CD player, for that matter.

Climb into the back, which is no easy task in and of itself, and you'll find the space cramped for anyone but kids. But while it's tiny, it's clever. Deep cut-outs in the rear of the front seats mean more room for your legs. Headroom, however, is a problem, and my (I'm 176cm) head was touching the roof.

There are two cupholders, at least, but - surprisingly - little in the way of entertainment connections. You will find an ISOFIX attachment point in both of the rear seats.

The boot opens to reveal a fixed 423 litres of space, which is handy enough for weekends away. Predictably, though, extra practical accessories are fairly limited - you can forget optional roof racks.

As it is with most of the Lexus range, the RC model comparison is pretty straightforward. You need to pick your engine (300 or 350) and then choose your trim level (how much you want to pay), be it Luxury, F Sport or Sports Luxury. Only the RC F model line differs, because here you can choose from the base RC F trim, or the more expensive RC F Carbon.

Engine and kit aside, the RC family is the same basic set-up; four seats, two doors and coupe styling. The rest, then, depends on your intended price range.

Entry-level Luxury cars - $65,400 for the 300, $68,400 for the 350 - arrive with 18-inch alloy wheels, LED headlights and fog lights, leather trim, standard  navigation, heated and ventilated front seats, dual-zone climate and keyless entry with push-button start.

Step up to the F Sport Trim - $74,700 for the 300, $77,700 for the 350 - and you'll get bigger 19-inch alloys, a better Mark Levinson stereo and rain-sensing wipers.

Finally, the Sports Luxury models - $84,900 for the 300, $87,900 for the 350 - get better seats, some fancier cabin furniture and a moonroof. All the RC models get a new 10.3-inch screen (but no Apple Car Play/Android Auto).

Step up to the the V8-powered RC F models - $138,100 for the base model, $152,300 for the RC F Carbon - and you'll add adaptive variable suspension and an improved safety package that we'll come back to under the Safety sub-heading. The Carbon variant - predictably - gets a carbon-fibre roof panel, active rear wing and some carbon-fibre interior trim elements.

On the colour palette, the regular RC range is available in 'Sonic Quartz' (white), 'Mercury Grey', 'Premium Silver', 'Sonic Titanium' (another silver), 'Onyx' (black), 'Graphite Black' and 'Infrared' (red). The performance-flavoured RC F cars nab some extra choices, including 'Cobalt Mica' (blue), 'Lava Mica' (orange) and the brand's new hero colour, 'Zinnia Yellow'.

A moonroof (or sunroof) is standard fit on the RC F models, as well as the Sports Luxury trim, while it's a cost option on the cheaper cars. Speaking of which, you'll find all sorts of goodies in the accessories catalogue, including unique floor mats.

Each price listed is the RRP, of course, so you'll be paying more in on-road expenses. But you knew that already, right?

The big news for the majority of S-Class buyers is the new engine in the S 350d, which is a 2.9-litre in-line six-cylinder turbo-diesel with 210kW of power and 600Nm of torque. It has a nine-speed automatic and is rear-wheel drive (RWD).

That same diesel engine is wicked up in the S 400d L, with that model churning out 250kW and 700Nm, and remains rear-drive with a nine-speed auto.

The petrol model range is opened by the S 450 L with a 3.0-litre six-cylinder twin-turbo mill producing 270kW/520Nm. Again, nine-speed auto, RWD.

The S 560 and S 560L run the same 4.0-litre twin-turbo V8 petrol with 345kW of power and 700Nm of torque. Nine-speed auto, rear-drive - naturally!

The AMG-fettled S 63 has a thumping twin-turbo 4.0-litre V8 petrol engine with 450kW and 900Nm, with a nine-speed MCT multi-clutch auto and - you guessed it - RWD.

The more you spend, the more you get. Spring for the 300, and you'll find a 2.0-litre turbo engine nestled under the bonnet, good for 180kW at 5800rpm and 350Nm at 1650rpm. It pairs with an eight-speed automatic, and shuffles power to the rear wheels.

Step up to the 350-badged cars and your engine specs improve accordingly. You'll now find a 3.5-litre V6 motor providing the horsepower, good for 232kW at 6400rpm and 380Nm at 4800rpm. The gearbox (eight-speed auto) remains the same, and the power is still sent to the rear axle.

The pick of the power bunch, though, is the 5.0-litre V8 engine nestled in the RC F cars. It'll fire 351kW at 7100rpm and 530Nm at 4800rpm toward the rear wheels - more than enough to shift the 1820kg (tare) weight. It's paired with an eight-speed automatic, or what the Lexus spec sheet refers to as a "Sports Automatic".

There is no AWD or manual transmission option anywhere in the range, and for specific oil type etc, consult your owner's manual.

The diesel models are - unsurprisingly - the most frugal in the range, with the entry-level S 350 d using a claimed 5.4 litres per 100km across a range of disciplines.

The S 400 d L - which uses a higher-output version of the same diesel drivetrain as the model above - uses only a minuscule amount more: its claim is 5.5L/100km. 

The most frugal of the petrols is the S 450 L, with its six-pot petrol twin-turbo using a claimed 8.4L/100km.

Every model has stop-start - including the AMG - and the V8 petrols also feature cylinder deactivation when in 'Eco' mode.

That cylinder deactivation system helps the S 560 achieve an incredibly low claimed consumption of 8.5L/100km. So does the longer, slightly heavier S 560 L.

The higher-out Mercedes-AMG S 63 L uses 9.0L/100km, according to its claim. Amazing for the outputs of the engine.

Let's start from the top, shall we? There is a price to pay for power, and the V8-powered Lexus arrives with its claimed 10.9L/100km on the combined cycle. That's quite a lot, and it's a number that will surely only worsen if you drive the RC F the way that you really should drive it.

Things improve with the 3.5-litre capacity engine, recording 9.1L/100km on the same cycle, while the 2.0-litre engine will return 7.3L/100km.

There is no diesel engine anywhere in the range, and the fuel-tank capacity across the board is 66 litres, with 95RON fuel required.

Smooth. It wasn’t even because I’d chosen the Energizing Comfort Control mood to elicit that vibe. It’s smooth - and so it should be.

Whether it’s the near-silent new six-cylinder diesel, which hauls the near two-tonne sedan along with less fuss than a medical centre receptionist dealing with a room full of coughing patients. There is no fuss. You just hand over control to the engine, and trust it will get you where you need to be.

The V8 petrol in the S 560 also has a bit of a silent killer vibe to it. There’s perhaps not as much noise as a V8 fan might want, but the mumbo is there, and in both cars the gearshifts are sublimely timed and super smooth.

Admittedly, the stiff-sided run-flat tyres on both the 19- and 20-inch wheels can exhibit a slight terseness over sharp edges, but when it comes to rolling over pockmarked surfaces or rougher country backroads, the ride offered up by the air suspension with variable dampers is superb. Put it in Sport mode and it stiffens up to the degree you’d expect, but Comfort is no doubt the best place to be.

The steering is super light but accurate, meaning it’s easier than you’d think to pilot this behemoth of a sedan through corners. The grip on offer is excellent, too, even if traction can be an issue - I had a full couple of seconds of strobe light action from the traction control light when I buried the throttle in the S 560. 

I didn’t get a chance to drive the six-cylinder petrol S 450 L, or the S 400 d L. And, I’m really sad to report, there was no opportunity to drive the AMG S 63 L, either. 

But the overall feeling of the updated range is that it remains a deluxe and delightful limousine - whether you have the good fortune of being in the driver’s seat or not.

Having now spent a fair chunk of time behind the wheel of the V6 and V8-powered cars, we're ready to make a pretty bold claim: the six-cylinder engine is - and there's no other way to put it - simply more fun.

Shocking, I know, but there it is. There's effortless power on offer in the RC F models, of course, but it's the way that power is delivered that makes it feel like more of a loping grand tourer than a fire-breathing performance coupe.

For one, both the power and exhaust notes arrive in stages. So if you're gentle with the throttle - like you almost always are in the CBD or suburbs - it wafts around in near silence, the engine feeling anaesthetised, and like it's only using a tiny proportion of its available oomph.

The V6 engine just feels sportier. It's still not super emotional, but I think it reacts to inputs quicker.

Leave your foot buried, however, and the character transforms, the exhaust booming into life and that big V8 finally unlocking its prodigious power. With the adaptive dampers (no air suspension) set to the sportiest setting, it sits flat in corners, with nary a roll through the body. And while there isn't an intimate connection with the road below, nor masses of feedback through the steering, it does acquit itself well on the bends.

But... the V6 engine just feels sportier. It's still not super emotional, but I think it reacts to inputs quicker, and comes alive a little lower in the rev range than the big V8. It doesn't really matter if you're in Normal, Sport or Sport+, it just feels more vibrant. Hell, you can even get the traction light flashing if you're particularly silly with the accelerator.

And as such, it's our pick of the bunch. Sure, it can't match the outright performance of the V8, nor the speed of its 0-100km/h acceleration time, but it puts a bigger smile on your face in normal, day-to-day driving. And let's face it, that'll be 90 per cent of the time you spend behind the wheel.

Standard safety across the RC includes dual front and front-side airbags, as well as front airbags for the second row. You'll also find a knee airbag for both driver and front-seat passenger. Forward-collision warning with AEB (and pedestrian protection) is standard fit, too, and so are front and rear parking sensors and a parking camera.

F Sport and Sports Luxury-badged cars add blind-spot monitoring and rear cross-traffic alert, along with lane-departure warning and lane-keep assist. The RC F and RC F Carbon both get radar cruise control and an active lane-departure system included in the standard offering.

The Lexus RC range is yet to be crash-tested by ANCAP, and so is yet to receive an Australian safety rating.

Mercedes-Benz offers a standard three-year/unlimited kilometre warranty.

Servicing is due every 12 months or 25,000km on all engines except AMG drivetrains, which require servicing every year or 20,000km. 

Mercedes-Benz has a (pricey!) capped-price servicing plan. The standard diesel and petrol models in the S-Class range cost $596 for the first service, and $1192 for the second and third visits. The costs for the sole AMG model is $736 for the first service, then the second and third visits are $1472 per.

The RC range is covered by a four-year/100,000km warranty, with service intervals pegged at 12 months/15000km. There is no capped-price servicing program on offer, but Lexus will guarantee you a loan car every time your vehicle is in the shop, and will even come to your house or workplace to collect - and drop-off - your car.

For any owner-reported reliability problems, keep and eye on our Lexus ownership page.