Jeremy Clarkson pits Porsche against Yamaha for a hot lap around Thruxton: http://www.sportbikerush.com/vids/misc/Porsche911_vs_R1.avi

Cool Vid, but the track plays into the equation. Seems to be a very short and twisty track, perfect for AWD. Imola or Monza would be better tracks. Less than a second difference and 911=$90,000 and R1=10,000. I'm sticking with the bikes when it comes to performance.

I think it would only take me one day on a bike to lay it down