Throw in an ecu and you will find not a lot of cars can beat you at the lights (due to the GTR's AWD system) and even rolling start they might not be able to beat you because there's a limit to their high end power.
However, a stock untuned GTR will take a while to come on boost and until then, you're just another straight six 2.6L coupe. I've got no doubt on track or bend you'll beat your mate with the soarer but its another story if you're dragging him on stop or rolling start. Make use of your AWD and launch it hard but I wouldnt recommend doing a 7k launch on the street.
At the end of the day, same power same skill, gtr will beat the soarer and you'll find that they'll need significantly more power to be able to outrun you.
ps: I know a TT 350z with 293rwkw and that thing is VERY fast. I even know I can outrun him with a launch and I'm only on 255awkw.