I read a british mag that reviewed the 599, LP640 and 997 Turbo, though not side by side. Don't remember the mag name, sorry(topgear??). But the writer who reviewed the LP640 loved it to bits and said that it is a different beast altogether from the 6.2 Murcielago. Its a must-have. The engine is so gloriously free-revving and steering response superb. The LP640 I think now is on a different level. It is THAT good.