I disagree. The Z350 is sportier, better handeling and value for dollar I think is the best sportscar you can buy. The Brembo brakes are available on the Z just as on the G35. You seem to have more options to go with the base package or the Track, where as in the G35 you are limited. The 2+2 is bennificial if you are looking for extra room or somewherer to stuff the kids. But for Myself, if I was concerned about backsets... I wouldn't consider the Z in the first place. I have had the chance to test drive both. I love the Z and put my deposit down.
Happy driving all.