Just to get you up to speed, the GTR is the 3rd fastest car MotorTrend has ever tested.
1. Bugatti Veyron 10.4 qtr at 124mph
2. Lamborghini Aventador 10.6 qtr at 133mph
3. Nissan GTR 10.8 qtr at 127mph LINK
I believe the fastest BMW is the M6 Coupe, which runs the quarter at 12.2, there was a 2010 BMW M5 GTS that ran the quarter in 11.9, still not very close at all.
You underestimate the power of the GTR, it is ridiculously fast and one of the fastest production cars period (0-60 of 2.7 seconds 0-100 of 6.7 secs) yet alone it's price point, and a V6.