Originally Posted by NINEZeRO

Well the RS5 will have a 450-480 hp engine (either a twin turbo 4.2 FSI V8 or a detuned Gallardo V10). So in straight line performance it will match or better the class leading C63. The S5 is supposedly a much better handling car than the S4 because of the engine position (moved back behind the front wheels) and a better F/R weight ratio. So it would be logical to assume that the RS5 will handle better than the RS4 which is not a bad handling car itself. So most likely the RS5 will handle very close to the BMW M3 or maybe even better. I dont think I have to mention the build quality, safety and refinement of a Audi A5/S5, and an RS5 would be even better. So the RS5 beats the class winner M3 in two of the three major categories and ties or maybe even beats the M3 in handling. btw someone mentioned the price but the RS5 will most likely cost about 3-5k more than the RS4 which is around 74k fully loaded vs C63 ~73k fully loaded and M3 ~70k fully loaded.