Noah runs mk22's (somewhere between card & subcard). I think that he runs them fob indors when he can. I'm sure that he'll chime in.
Kingita & microburst run mk21's at times...
I run the mk22 everywhere. Sounds great FOB, OTS, indoor and out.
I also run a m21/mk8 rig FOB.
I also own a pair of the mk4v, but find that when I run mk41v, mk22, and mk4v, the 4v's are my least favorite pull. If I could only have 2 pairs of schoeps, they would be mk41v and mk22.