The CTS-V is a beast and would likely smoke us M's at the track (curvy or straight). I've run the Daytona road course (Rolex 24hr config) with Z06's (505hp) and they outperformed me by quite a bit. The Caddy is heavier, but also has more power and would likely do the same. I will still take my M over the Caddy, but only on preference not performance. I have yet to drive one though so can't comment on feel. I have driven the Z06's on the other hand and stats aside, I wouldn't swap. It's just not as responsive as the M (throttle or steering wise). Beautiful car with amazing performance, it just doesn't communicate to you as well. Of course, had I chosen the V over the M, who knows what song I might sing...

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2005 ///M3 Competition / Interlagos Blue-Black /6spd/SS Race Exhaust/Angel Eyes/Passport HW/Mich. Super Sports Soles (love em)
2008 ///M3 Melb Red w/ Beige Novillo, Tech, Prem, & 19" (Retired)
2005 X5 4.4i Estoril/Grey Sport, Nav, DSP, Prem, Pano, etc. (Wifey's)
2007 335i Silver/Black SP,PP,CWP, Comfort access, & Sirius (Retired)
2001 X5 3.0i (Retired) Silver/Gray Sport w/19"/Prem/DSP/CWP
2002 YZF600R (Retired)