Just spent a while looking at this car using the hi-res pictures.
I actually don't mind the C-pillar and I think the car is generally quite nice. I can see the why there is controversy - Cadillac could have avoided it all by just giving it a "normal" back window. Probably should have done that.
Anyway - this could be my new car next year. My CTS is getting old and I'm ready to step up!