Funny how the "old" "bad handling" Z4M is 1.5 secs faster than the 370 around top gears track:
Top Gear TV show - BBC Top Gear
Nissan 370Z lap times and specs - FastestLaps.com
Shows that it really depends on track and driver since the cars are close. I do find the motor in the 370Z disappointing - however it is a big step up from the 350Z.