BMW M4 reviews are coming thick and fast, with Auto Express the latest publication to get behind the wheel of the new M car. Price and performance wise (in the UK at least), the Audi RS5 represents a solid competitor with its 4.0-liter V8 rated at 430 hp, compared to the M4's 425-hp twin-turbo straight-six powerplant. Both come mated to dual-clutch boxes, with the M4 sending power exclusively to the rear whereas the Audi utilizes its quattro four-wheel drive system. And both are very rapid, very capable cruisers.

But which comes out on top on the track? Check the video to find out.