i personally would say that the gtr will give the corvette for a run for its money, not here in the us, but in every other part of the world. people will want to say usa usa, when really there maybe a better car out there.
people capacity:
gtr - 4 maybe 5 if in the rear middle
vette - 2
personally not just because im a nissan guy, but because i feel the gtr is a better car period. the thing weighs so much, just can be controlled as if it was a small car. reminds you of the supra anyone?
the advantages of the awd system that nissan has developed is pretty crazy engineering if you ask me. which one is more cool? the gtr. sure the vette and the gtr both has history, but its one hell of an accomplishment when you have to have special built rims for the car to hold on the tire, since it can corner so hard and easily.
besides, when you decide to get off the track and drive back home, you can in the gtr. you can too in the vette, but you wont be as comfortable. you can fit your family in it when your done too. this is something that isnt done with a vette, nor a carerra or anything.
now, watch the gtr race with jeremy clarkson, and tell me that the gtr isnt amazing.
http://www.youtube.com/watch?v=YufVos_Nxhw
im sold. nissan engineering at its finest. nissan will win easily in jgtc as it did with the 350z