The GT-R is amazing for what it can do with its weight and power. The stock car is extremely fast for a couple laps but in an endurance race there is no getting around the fact that it is running with 3800lb. Even in those (some claim biased) Best Motoring 5 Laps Battle in Tsukuba, the GT-R's is obviously slowing down near the 4th and 5th lap.
Go watch the battle between the 07 GT-R and old Gallardo Superleggera to see what I mean.
The GT-R is a car that pushes the envelope of technology while the Corvette is a car that pushes the boundary of classic mechanical engineering theory if that makes any sense.
GT-R vs Corvette, it appears even by today's technological standards, there is no defying the laws of physics (Weight, power etc.)
As much as many don't like the 4WD+Double clutch trickery, I think the GT-R designer is on to something though. (Perfect torqueband, efficient power delivery, superb traction) It'll be interesting to see other sports car maker take note of this and improve upon the GT-R.