I have actually been fortunate enough to drive a CTS-V of a close friend of mine (albeit a wagon) It's a badass car for sure! Just love the noise it makes. Rear headroom was pretty bad but cargo space was great. It's also a 6spd which made it that much more fun. Can't wait to break in the M5 and compare the two.
Current: AW/SO F10 M5 H&R Springs, 12mm/10mm Spacers
Sold:Imola Yellow RS4-KW V3, MTM 10mm spacers, Hotchkis rear sway bar, APR Stage 1, Milltek Catless, RNS-E, Euro RS4 Flat bottom Steering Wheel