I class this one of the S5's best results to date, to basically match the 335i on the track suggests that away from the track and on the road the Audi will walk away because on it's better traction and confidence inspiring quattro system.
I remember that on this very site the 335i has had two victories around the track compared to the Z4M and the RS4, but most telling is that in equal conditions the S5's extra grunt would equal an easy 5+seconds over the 335i around the ring.