BMW M5 vs BMW Alpina B5
What's the difference?

BMW M5

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2025 price

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BMW Alpina B5

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2020 price

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Maserati Quattroporte

Mazda 6

McLaren Artura

Mercedes-AMG E63

Mercedes-Benz A-Class

Mercedes-Benz A35

Mercedes-Benz AMG GT

Mercedes-Benz C-Class

Mercedes-Benz C43

Mercedes-Benz C63

Mercedes-Benz CLA

Mercedes-Benz CLA-Class

Mercedes-Benz CLS-Class

Mercedes-Benz E-Class

Mercedes-Benz S-Class

Summary

2025 BMW M5

2020 BMW Alpina B5

By John Law

By Laura Berry

Safety Rating

Engine Type

Bi Turbo V8, 4.4L

Twin Turbo V8, 4.4L

Fuel Type

Premium Unleaded/Electric

Premium Unleaded Petrol

Fuel Efficiency

3.0L/100km (combined)

10.9L/100km (combined)

Energy consumption

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Electric range

67 km

Battery capacity

22.10 kWh

Seating

Likes

Stunning speed
Drive mode customisation
Impressive agility

Fast
Comfortable
Luxurious

Dislikes

Awkward boot
Brake and steering feel
Low on hooliganism

Cleaning the wheels
Room and storage space could be better
Not the most engaging car to drive

2025 BMW M5 Summary

Balancing luxury car comfort, hot hatch agility and supercar speed is no easy task, yet that is what made the six previous generations of BMW's M5 so iconic.

In seventh-generation ‘G90’ guise, the M5 has another skeleton in the cupboard: the toughest emissions regulations that Europe, and now Australia, have ever seen.

A twin-turbo V8 was untenable and going battery electric was not an option. Plug-in hybrid was the only answer. For the new M5, BMW combined a revised 4.4-litre ‘S68’ bent eight with a punchy electric motor for 535kW and 1000Nm.

Problem is, the G90 is widely acknowledged as one of the greatest BMW M cars of all time, especially in CS trim. And thanks to a circa-600kg weight hike to nearly 2500kg, the new M5's 0-100km/h claim is actually slower than the old 'F90' M5.

Doesn’t exactly sound like a big leap forward, does it?

A drive through the Central West of NSW and around the iconic Mount Panorama racing circuit gave us answers to two questions. Does the M5 work on Australia roads, and does BMW M's latest super-sedan represent progress?

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2020 BMW Alpina B5 Summary

The BMW Alpina B5 Bi-Turbo is not actually a BMW. Not according to the German Federal Motor Transport Authority, at least.

Nope, the modifications applied by tuning house Alpina to the 5 Series are deemed so significant that if you open the bonnet and look inside the engine bay, you'll see that the BMW VIN has been struck through twice and an Alpina vehicle number stamped underneath it.

The B5 is not the first model to be recognised in this way, either; the German government has recognised Alpina as a seperate car manufacturer since 1983.

The B5 has other ‘B' siblings, too. There's the B3 S Bi-Turbo, which is based on the BMW 3 Series, the B4 S Bi-Turbo (the BMW 4 Series) and the B7 Bi-Turbo (I don't need to tell you what this is based on, right?) which I've reviewed, too.

So just what has Alpina done to this unsuspecting BMW 5 Series? Is it really worth the extra money? How does the B5 compare to an M5? Could it actually be superior? And did they really take the speed limiter off to let it warp-speed to beyond 300km/h?

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Deep dive comparison

2025 BMW M5 2020 BMW Alpina B5

Verdict

Let’s get one thing out of the way: the new M5 is a very good car. Considering the emissions limitations and size increase of its base model, it is an impressive bit of engineering.

What’s trickier is deciding whether the new car is really better to drive. Less edgy but supremely comfortable and quiet; BMW leaned into the daily usability of the plug-in hybrid M5 rather than amping the petrol-electric system for maximum thrills. And do you know what? That’s fine with me.

The new M5 still performs on road and track and does an incredible job of hiding its weight (most of the time). Perhaps the G90 is a little more Audi RS6 than F90 in its demeanour but some would argue that’s no bad thing.

The concept of the BMW M5 is not static, it evolves with the times, and the G90 is no exception. Expect future Competition and CS variants to unlock some extra lunacy.

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

Verdict

The Alpina B5 is a special car – more special than most people will ever give you credit for if you own one. Those that do know what an Alpina is will let you know; people will cross dangerously busy streets to talk to you about your car. Insanely fast, almost incomprehensibly comfortable and effortlessly powerful to drive.

BMW M5 vs BMW Alpina B5 What's the difference?

Summary

Deep dive comparison

Verdict

Verdict

BMW M5 vs BMW Alpina B5
What's the difference?