My dad just bought the 2007 sedan. You can really see the difference in the 2007, the HP is alot higher compared to the previous models, and the overal look of the car is much better in my opinion. And the XM sat. radio just kicks ass lol
2007 sedan has more horsepower, but the overall look compared to previous models makes it look like it's a bloated old lady version of the previous models.
Cosmetic-wise, I think 2006 is the G35 Sedan's prime.
Plus, I prefer my AVIC-D3+iPod Integration over XM. =D
I dunno man, when i see a 2003-2006 model i can pick out the the differences right away. The head lights aren't as sharp, and the rear end doesn't have as much kick. BUT its an opinion that we're all entitled to.