Just traded my 08 M3 for a z06 this weekend.
Had an opportunity to view the new cts-v coupes. My opinion is the coupe version has really ruined what the sedan had to offer. Sitting in the front seat in a comfortable position did not give much leg room for the rear passangers, and the trunk room was about the same size as the m3. The interior has a strange shape that contours around you ineffectively, it has a weird feel to it.
For the value, the CTS-V sedans are where its at with the utility access, and I believe the sales will continue to hold strong over the coupes.