There's no denying those numbers.
I use to be able to justify the purchase of my Z4M on refinement, and build quality. I no longer believe it makes up for the ever increasing gap in performance. The C6Z06 is class all of it's own.
Toy: 2008 Silver Z4MC 300WHP/241TQ
Mods: OEM Euro Headers, RPI Scoop
Daily: 2010 Tacoma Double Cab