Check this video out...
ZR1 vs GTR at the 'Ring - Garage419 | Garage419 - Car guys love to argue. Let the debate rage!
Looks like the ZR1 beat the GTR and watching the videos it appeared to me that the ZR1 pilot was close to losing it a few times and that turning that time in the ZR1 was harder than turning the nearly same time in the GTR.