I agree with Jeff B. The M3 was introduced in 2007. Far much older than the RS5 and the fact that the Audi is only faster by that little shows how far behind is Audi in their technology. But props to Audi.
Ah but fairly close in nearing perfect conditions which suit the BMW most. In the real world (times with damp, wet, ice, snow) where most of us do most of our driving, the RS5 will be MUCH faster. BMW still a great car though.