Tim Pitt drives the latest ‘G90’ M5 on UK roads. How does this hot BMW saloon compare to rivals from Audi and Porsche?

Especially when an automaker like Mercedes-Benz decides to give us another chance at not just a wagon but a new very fast ...

No, it's not a direct rival to the M5 and RS6, but Mercedes is democratizing the fast wagon (sort of) bringing this E53 ...