MotorTrend has finally released a video of their recent track comparison
between the McLaren P1 and
Porsche 918 Spyder.
Obviously, the supercar that is missing from this comparison is the Ferrari LaFerrari. The reason is, to put it simply, that the Italians didn't want their car to compete against the competition unless they get a chance to "enhance" it.
Read more about the comparison here.