In the middle of the nineties my Schoeps CMC's were modified to B&K electronics alike designs, first with phantompower and later based on separate power-leads with 60V basic voltage for both preamp and capsule.
The results were not that much better from the original Schoeps designs, except the low end was a bit more tight with the MK2 and MK2s. What people have described here on the forum I can recognize, but in my opinion there may be another aspect causing disappointment with users.
Mylar/PE/polyester made omnis (Schoeps mk2(s), Neumann km183) do have higher mechanical distortion than e.g. the nickel DPA and B&K omni (measuring) microphones. When their behaviour is very neutral, like the Schoeps MK2(s) or H, this distortion might be more obvious and disappointing than with brands like Neumann, where aside the mechanical distortion also more musical colouration is a part of the design, and as a result the whole concept seems to sound more appealing.
Anyway the Schoeps cardioid MK4 for me belongs in the absolute top ten of cardioids, aside the DPA 4011, Sennheiser MKH406, Beyerdynamic MCD100, Sanken CU44X and others.
Erik Sikkema