​Video: Audi RS5 versus Lexus RC F​ - better than an M4 or AMG C63?

Which is better, then? The Audi RS5 or the Lexus RC F?

Conventional thinking says neither, and that you buy a BMW M4 or Mercedes-AMG C63 coupe instead.

But what if you don't want to be conventional? The RS5 and RC F are both brawny, four-hundred-and-something, four-seat coupes. 

Both have performance to spare but both go about their business in very different ways. The RC F is a rear-drive car with a 5.0-litre, naturally aspirated V8. The RS5 is the epitome of downsizing, featuring a 2.9-litre twin-turbocharged V6, which drives through a quattro four wheel-drive system.

We put the two alternatives to the mainstream to the test, to see which comes out on top ...