I also wondered about that mic for awhile too. Doesn't get much hype like the 47's. But I decided to finally try it, and it was very nice. Also had a Peluso P12 on hand, and the Wunder CM12 was better no question, and all three people in the room agreed. The Wunder excelled on acoustic guitar, and was nice on drum overheads. If I had kept the CM12, I'd always use it on acoustic, it was that good. However, I preferred the Wunder CM7 v15 for vocals, what a great mic! If I wanted something different, I'd choose a 251 over a C12 for vocals. If I was a true slut, I have a pair of each of them!
The Peluso P12 wasn't bad though and it did do a nice job. But it didn't sound as full and as detailed as the Wunder in my opinion. Is that margin of "betterness" worth it at roughly 5k more? The Peluso will get you in the ballpark, but the Wunder will get you on base. I never heard a vintage C12, so maybe that would get you a grand slam. Sorry for the cliche analogy.
One last thought, (if you're going on looks) aesthetically, the CM12 is a beautiful mic, like a work of art, no really a site to behold..LoL Swivel mount, jewel, all cool and well done. Mike Castoro (at Wunder) puts out top notch stuff and is a good guy. Definitely a company to keep your eye on...