I really like the G35. It has clean lines and looks fast standing still. The interior is also a masterpiece of simplicity. The G37, not so much. The front looks too much like the sedan, which is, imo, one of the ugliest luxury/sport cars on the market. The interior is still relatively clean and classy, but less so than the G35. Since a new G37 costs well beyond what I would ever pay for a vehicle, I'd be quite happy with a well cared for used G35, which I happen to like better anyway.
On another note, an aquaintance had a G35, but when a child came along he and his wife traded for a BMW 3 series sedan, for the obvious need of four doors. He doesn't like it nearly as well as he did his G35. Nor would I.