Great info and examples here, but now I’m starting to question the pair of CCM 4 I have on order 
Don’t question your order.
For nights 1 and 2 of Vegas, I ran the mk4 in exactly the same configuration as I ran the 21 nights 3 and 4 - 30 cm, 60 degrees. That can be found here:
http://bt.etree.org/details.php?torrentId=614288I think the mk4 is a fine cap capable of stellar recordings, and I’m very happy with this tape. The mk4 is a much more forgiving cap w/r/t set up and sensitivity, and if I weren’t in a great sounding spot I’m confident it still would have made a great tape. A good way for me to word it is - I think the mk4 has a lower ceiling than the other Schoeps caps (the mk21 and mk22 sound we all lust after), but it also has possibly the highest floor of any cap. To my ear, it’s got plenty of bass, decent audience chatter rejection, a pleasant and musical treble, and the sweetest midrange of any microphone I have ever heard. It will always be the cap I reach for first, and I will always love the sound of tapes made with the mk4.
Arguably, only the 41 is a more reliable cap as far as pulling a “clean” tape, but I’ve heard many mk41/mk41v tapes that I liked but didn’t love, and I’ve never heard a mk4 tape I didn’t love.
Take it from someone who bought, sold, then bought again a pair of 4’s. Keep them, you’ll love the tapes you make with them. Add a pair of 21s or 22s to your locker down the line.