Jaguar XJ vs BMW M5

What's the difference?

As a child, my parents - who aren't car people - would see a Jaguar and point. It didn't matter if it was an XJ, Daimler Double Six or a Mark II, there was a great deal of mystique around these bastions of Britishness. It also didn't matter that these weren't necessarily good cars. The Seventies and Eighties saw the brand slide into a funk while being passed between owners like hot potatoes.

Somehow, the brand survived its brush with Ford's useless Premier Automotive Group strategy which only came good towards the end as Jaguar's management woke up and put in place a change in direction that produced the Ian Callum-designed XF. Riding high on that design, Jaguar then promptly introduced the very pretty Jaguar XJ.

It has been on sale for ages, but with the addition of a few bits and bobs to stay competitive, it's as compelling as ever. Most importantly, the performance-focused R has kept its unique supercharged V8.

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?