acidjack, almost complete agreement. In any situation where the KM 150 delivers exactly the sound you want, the CMC 641 would probably sound heavy and probably a little less "involving."
Conversely, however, in any situation where the CMC 641 delivers exactly the sound you want, the Neumann would tend to sound thin as well as maybe a bit edgy or metallic, if that isn't too strong a term. The little peak that most of the current Neumann KM series microphones have isn't in what I'd call the "presence" region, which would be about an octave and a half lower (some other Neumann and Microtech Gefell microphones do have that type of peak, around 3 - 4 kHz); it's more in the "sparkle" region, I'd say.
As I said, I have both types and use them both, but not interchangeably. And if I had to, I could use an equalizer to make the Schoeps sound like the Neumann--but it would be harder to make the Neumann sound like the Schoeps, because it's always easier to start with something that's more neutral and color it, than it is to remove a coloration and then apply a different coloration.
--best regards