Bentley Flying Spur vs BMW M5

What's the difference?

In any other super car, it would seem deeply strange, wrong even, to loll (and LOL) in the back seats while a colleague blasts you around a race track at insane speeds, and not just because cars with V12 engines making 575kW and 1000Nm don’t normally have more than two seats.

The Bentley Flying Spur Speed is, of course, no ordinary car, it is a super sedan, a luxe limousine crossed with a rocket ship, and if Sir wants to get to the rooftop helipad in a spectacular hurry, then these are the back seats to be sitting in.

We flew to Japan, and the spectacular setting of the Magarigawa Club, a members-only race track carved out of the rolling hills outside Tokyo at a rumoured cost of $US2 billion, to try the back seats, and the driver’s seat, of the new and very impressive Flying Spur Speed.

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?