F430 vs M5

Did anyone read this comparison test in Autocar magazine? I haven't read it yet, but glanced at some of the test numbers. What is surprising is that the M5 accelerates to 150mph slightly quicker than the 430 (I can't remember the exact difference, fractions of a second). Considering that both cars have about the same peak power output, it's a little hard to believe that the M5 with all that extra weight could keep up with the 430, much less outsprint it.