I ran some vintage AKG ck3 capsules on Wed. night with c452eb amplifier bodies. I was really happy with the results, and kind of surprised how much low end warmth they had. I expected more brightness, and having heard a few recordings made with c460b/ck63 from the same location, I was very pleased. The ck3 caps seem to me to have a little more mid-high presence vs. the ck63 caps.
I think I still like the ck63s better, but am now anxious to play with the ck3 caps with c460b/a60 vs. c45_ amplifier bodies. Soon than later I hope to do my own comps when I can score a ck63 pair.