Mercedes-Benz S600 vs BMW I7

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.

The i7 xDrive60 M Sport is close to the perfect 7 Series. From the comfort of being driven in it, to the ease of driving it, even for hours on end.

The i7's range of 625km is outstanding for an electric vehicle, but a petrol powered 740i will get you about 900km on a full tank. How many kilometres a day will you cover? Do you have time and a way to charge the i7 daily if you do cover a lot of distance?

If driving range isn't an issue, the i7 will reward you with a smooth, effortless driving experience and your passengers will have a serene journey in luxurious, high-tech surroundings. Just don't bump the door release button accidentally!

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.

At 5.4m long and 2.2m wide the i7 xDrive60 M Sport is enormous and imposing  - as a 7 Series BMW should be.

What's significantly different in the look of this latest incarnation of BMW flagship limousine is its show stopping face.

That LED-lined grille has Vegas pizazz and the pretty glittering Swarovski Crystal headlights are mesmerising. I doubt the words 'pizazz' and 'pretty' have ever been used to describe any previous generation BMW 7 Series.

Fear not, though, from every other angle the i7 looks business-like and serious… and solid as though carved from a single slab of marble.

Solid is also a good word for the i7's interior. Look at the seats in the images - they're hotel lobby sized and I'm still uncertain how they managed to fit them through the i7's doorway.

Our car had the Merino Tartufo brown leather upholstery which suited the 1970s-style futuristic design of the seats with their headrests wrapped in carbon fibre and the satin aluminium trim throughout the cabin. They look like seats from the bridge of a spaceship in a sci-fi series.

The enormous 31.3-inch screen in the rear is a show-stopper as are the tablets in the rear doors to control the screen functions along with the seat heating and adjustment.

Disappointing in comparison is the smaller media and instrument displays up front. And it's not just the lesser proportions but the styling of the screens that's a let down.

Surely this was a chance for BMW to integrate a large, flowing interactive screen over the dashboard and not something which looks propped up and an afterthought to the design of the cabin.

I also find the crystal-effect plastic that trims the dashboard and extends into the doors a little over-the-top, especially when it's backlit with LEDs.

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.

Sure, the i7 isn't an SUV but a sedan like this needs to be roomy and comfortable, it also needs to be an ergonomic place to work for passengers in the back with laptops, and it needs to be well appointed with internet connectivity and charging outlets. A boot that can take at least two passenger's luggage is also vital.

The i7 has all of that covered with good legroom in the second row even for me at 189cm tall. I spent two hours back there writing my script for the video for this review while the i7 was charging.

As I typed away I had plenty of elbow room but I could have done with a tray table for the computer.

There's a wireless phone charger in the fold-down rear centre console, along with USB ports galore.

You'll find another wireless phone charger up front and more USB ports. The i7 also has its own internet hotspot.

The sumptuous seats in the rear are power adjustable and also heated, but lack a massaging function.

There's also rear dual-zone climate control and sun-blinds which cover the back and side windows.

Cabin storage is good with large covered areas in the front and rear centre consoles, plus there are two cupholders in the rear and another two up front, with large door pockets, as well.

The cargo capacity of the boot is a healthy 500 litres but it's quite shallow due to the electric vehicle batteries eating into the luggage space.

The automatic doors can be opened several ways from the inside.

First there's a button inside which is high on the rear door and another on the dashboard which will open them automatically while using sensors to ensure they don't hit anything.

There's another button much lower down which will pop the door open slightly for you to push it the rest of the way.

Finally there's an emergency handle which will override the electric opening.

You can open the doors from the outside automatically by pushing a button near the door handle or by using the exterior door handle normally.

Closing involves pressing the high placed button if you're inside or by tapping the exterior button on the outside door handle if you've exited the car.

We did have a door mishap twice during our week with the i7. The first was when bags placed on the front passenger seat bumped the release button and caused the door to pop open, followed quickly by me lunging across to pull it shut again. It's lucky my arms are long.

The second was when my eight-year old son bumped the door release button with his knee again popping open the door but this time at 110km/h on the motorway. He was able to close the door but it rattled both of us, understandably and I kept the child lock on for the rest of the week.

He's been in a different test vehicle every week of his life since he was born and this is the first time we've ever had a door open unintentionally like this. I've also never had a door open, just because a bag has leaned on it, either.

So, the auto door opening function might create a nice impression and make opening and closing the heavy doors easier, but I think manual doors would be more practical.

The BMW i7 xDrive60 M Sport sits in the middle of the 7 Series range with a list price of $306,900. That places it above the $273K 740i which is the only combustion engine variant in the line-up and below the $345K i7 M70 xDrive.

Whatever you do, don't dismiss the i7 xDrive60 M Sport as an overpriced electric version of the 740i because it has many more standard features that enhance the luxury and chauffeuring experience.

We're talking automatically opening doors, a 31.3-inch media display in the second row and control tablets for it in the rear doors.

There's a 35-speaker Bowers & Wilkins surround sound system (not the 740i's 18-speaker stereo), power adjustable and heated rear seats plus an 'Executive Lounge' console, and a BMW Individual Gran Lusso interior with a choice of Merino or Cashmere upholstery.

Our car had the Merino Tartufo brown leather upholstery and carbon-fibre M interior trim.

The i7 also rolls on larger 21-inch wheels which fill the giant wheel arches perfectly.

The rest of the standard features list is almost identical to the 740i's and includes the imposing LED-outlined grille, the Swarovski crystal headlights and the panoramic glass roof.

Inside, the double screens for media and driver instruments are also standard, there's sat nav, Apple CarPlay and Android Auto, a head-up display for the driver, front row seats are heated, massaging and power adjustable, there are also electric sun-blinds for the rear.

Our car wore the 'Oxide Grey Metallic' paint which made my videographer very happy because apparently it shows contours better than any other colour even on a bright, sunny day.

At the time we published this review BMW was also supplying as standard a charging wall box and a five-year Chargefox subscription.

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 i7 xDrive 60 M Sport has two electric motors - one at the front one at the rear - making this large saloon all-wheel drive.

The combined output is outrageous. We're talking 400kW and 750Nm. That's enough oomph to fire this electric missile from 0-100km/h in 4.7 seconds.

When EVs first came out a lot of people saw the technology as lending itself to small city cars, but with the smoothness of motion is offers, the silent operation and the colossal grunt it can supply nothing suits a big limo like the 7 Series better than electric motors.

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.

There are removal trucks shorter and narrower than the i7 but this limousine is possibly the easiest and most comfortable car I've driven in almost 15 years of testing vehicles from Toyotas to Bentleys.

The steering is pinky-finger light but accurate, the ride (as driver and passenger in the second row) is superbly composed and the electric powertrain add a smoothness to movement that no combustion engine on the planet can come close to.

The xDrive60 M Sport comes standard with BMW's 'Executive Drive Pro' feature which includes the 'Active Roll Stabilisation' and 'Active Roll Comfort' systems used on Rolls Royces.

The systems use motors to level the body through dips and corners, and the result has to be felt to be fully appreciated.

It's oddly amazing - you could have a bowl of molten lava in your lap and not spill any of it.

And then there are the seats. As a driver the under thigh support offered by the big, thick, wide seat base is exactly right for long distances, while the back rest is supportive without being too firm.

If I was to name any downsides to the driving experience it would be the limited forward visibility due to the narrow windscreen and thick. short A-pillars.

I found myself always having to peer around those pillars at intersections and pedestrian crossings.

Rearward visibility is completely blocked when the second row's large screen is folded down and the rear vision mirror doesn't have a camera function to get around this issue.

Sure there's a reversing camera but being able to see what's coming up behind you in traffic is important to for safe situational awareness.

I'm also not a fan of the synthesised driving sounds. It's unnecessary, especially in something like a chauffeur-operated limousine.

I think it only serves to cheapen what is such a high-end experience. Thankfully you can turn it off.

The same goes for 'Boost Mode' which provides all available grunt once a paddle behind the steering wheel is pulled and counts down like a missile launch. Seriously? Come on - this isn't a 2 Series!

The BMW i7 has not been assessed by ANCAP and like many ultra high-end cars it probably won't be. But we would expect it to perform well given this is the flagship of the brand and fitted with every safety feature in BMW's arsenal.

There's AEB which works from car park pace to motorway speeds, there's lane keeping assistance and blind spot warning, rear cross-traffic alert and manoeuvre braking which will stop you from bumping into objects while revving and there are more than 35 different sensors.

One radar constantly gazes 300m ahead into the distance, although it would probably be bored in Australia with our lack of autobahns.

The i7 also has BMW's 'Evasion Assistant' technology which scans traffic in all directions and will activate an evasive manoeuvre into an empty safe lane if it detects you swerving to avoid a collision.

There are seven airbags onboard, including one between the front seats, full length curtains for the front seats and head protecting curtains for the rear occupants.

The xDrive60 M Sport also emits an acoustic warning to alert pedestrians that you're nearby. 

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 i7 xDrive60 M Sport is covered  by BMW's five-year, unlimited kilometre warranty. The battery is covered for eight years or 160,000km.

There's no regular servicing schedule but the car will identify any faults and maintenance issues and notify you. A six-year unlimited service plan is offered by BMW and is included in the purchase price of the i7.

The i7 also comes with a five-year subscription to the charge for charging network, and a home wall box charger.