all wheel drive is nice till about 70 or 80 mph then the Z06 just walks away.
Take off the runflats on A Z06 and see what happens.
The GTR is to heavy and doesent make enough power. Put a good driver that knows corvettes querks and put a great driver in the GTR and see what happens.
On a short track the GTR will beat a Zo6 because of the all wheel drive. But put the two on a track full of long straights and watch the Z make mince meet of the GTR
Ken has shown what a good set of tires on a stock C5 Z06 can do. Imagine that on a C6 Zo6 .
(or for the ultimate wet dream, a good set of tires on a ZR1.)