I agree with Stingray's take on the Z06 and BMW in general. I love the M3 and have said countless times I think it makes for one of (if not THE) best DD's out there where you get comfort, utility, refinement and performance all in one package.
I wouldn't expect to get loads of accolades on a BMW forum for any other car besides a Bimmer.
I also agree with Greg (shift@red) about the Z06 vs GT2, Ford GT, etc. But then again we are talking different price points as well.
As far as the interior goes, here is my 4LT interior (same as a 3ZR in a Z06/ZR1). No, it's not Porsche, Audi quality but "awful" is also not accurate. I don't find the M3 interior to be a big upgrade over a 4LT/3ZR Vette. Hell, nearly all of the auto rags call the interior "spartan".