Motortrend's July Issue rated the G35 #1 over the BMW 330i and the Cadillac CTS. The article should be up on their site July 1st, or you can buy the issue now.

In addition, Road and Track rated the G35 #1 over 10 other cars:
Acura 3.2 TL
Audi A4 3.0 Quattro
BMW 330i
Cadillac CTS
Jaguar X-Type
Lexus IS300
Lincoln LS
Mercedes-Benz c320 sport
Saab 9-5 Aero
Volvo S60 T5

For the whole R&T article (56k users, watch out, it's PDF and HUGE) click the following:
pages 52-56 (http://www.infiniti.com/m/press/g35/press_g35_roadtrack_01_theone.pdf)
57-65 (http://www.infiniti.com/m/press/g35/press_g35_roadtrack_02_theone.pdf)
66-74 (http://www.infiniti.com/m/press/g35/press_g35_roadtrack_03_theone.pdf)
75-78 (http://www.infiniti.com/m/press/g35/press_g35_roadtrack_04_theone.pdf)

You will need Adobe Acrobat to view the files, it's free at: www.adobe.com/acrobat