http://www.roadandtrack.com/article....rticle_id=6594
The 911 was third. The Vette placed second. GT-R won. All three posted the same 0-60 times, the vette reached 120 mph a full 2 seconds faster than the GT-R. However, the Nissan did better in the slalom and slightly better on the skidpad.
basically, all three cars were very close, I don't think the porche won a single event though. But if it were a race, the winner would be the best driver.
*edit -When looking at one of the spec sheets there is a drawing of the GT-R in profile and it looks alot like the Mustang to my eyes, well other than the very front of the nose