My opinon is as follows. I'm pretty sure that Nissan had made the idea for the 350Z before this G35 car and Infiniti looks like it pretty much stole the design except for the front and backend. The G35 is just 7 hp short of the 350Z with 287. Personally if anyone is wondering which one to buy, I'd go with the Nissan. I think it looks a lot cooler than the G35 and the 350Z is an add on the the Z collection.
INFINITI!!!