I've never been impressed with the G8 personally. Maybe it's just mr, but the interior seemed cheap, and I wasn't impressed with the ride. If it were to be a RWD, V8 powered sedan, I'd go 300C SRT8 all day long. It maybe big, but drives great. The power, ride quality, and interior are nicer than any G8.
Granted, the 335i seems to be some great bang for buck.