All this comparison shows is how closely these car compare on a track.
Laguna Seca proves that if any car has an edge it's the Z06/Z07, because a pro-driver will take each car to it's absolute limit.
...BUT, VIR shows that the 458Italia is much easier to control, and thus achieved a faster lap-time at the hands of novice drivers/journalists.
Everyone loves to bring up the tire advantage, but fail to mention the Ferrari's transmission advantage, HP advantage, and that it's using magnetic shocks that came from GM in the first place.
They're both great cars. Any real enthusiast would love the competition and stop this stupid pointless bickering...