no longer a contest
the Cayenne S is a 6 and half second car to 60 (like my E70 4.8). The new 5.0 is a rocket. Its nearly as fast as a 335. You could matchup a Cayenne turbo with a 50 and it wouldn't be terribly out performed. The Cayenne S is bunk. Maybe the new Cayenne is a different story?
I have a porsche. The Cayenne has never been superior to its equivalent X5, and they are notably more expensive.