The new BMW M5 is a terrific sports saloon. Or super saloon. Or sports sedan. Call it what you will: it's a big four-door executive car with a stonky twin-turbocharged V8 making shed loads of power, which it puts it through all four wheels - unless you stick it in rear-drive mode, in which case it only puts it through the rear wheels, obvs.
And if that sounds familiar, that's because it's exactly what the Mercedes-AMG E63 saloon does too: what with its four-door body, luxurious executive car interior, twin-turbocharged V8 engine and four-wheel drive with the option of rear ... well, you get the idea.
But which of these big saloons is best? Both as an everyday executive car, but also as an enjoyable car to drive. Step forward Autocar's two video-ready testers, as we find out which you should have: BMW M5 or Mercedes-AMG E63 S.