according to infiniti's website the G35 sedan with the "aero" package has a COD of .26 which sounds pretty low to me, the coupe has .28 with the "aero" package. ill post any more if i find them.
the mercedes 300SL had a coeff of .25 according to this website here.
http://www.ktsmotorsportsgarage.com/quiz/quiz19.html