Having owned an R33 GTR, in stock form they are not that quick, especially off the line in 'normal' traffic. Stock against one of the quicker STI's (V5/V6) I think it would come down to the driver. GTR's have a lot longer legs and will walk away towards the top end, but i'm more impressed with the STi's low end quickness...

Once Mods start getting done the difference starts to get bigger in the R's favour...

Cheers

Brett