Napo, Schoeps microphones aren't dark-sounding (with one possible exception: the MK 2 omni if it is misused in reverberant sound field conditions, instead of the close-up placement that it's designed for). Otherwise, most Schoeps capsules are very close to neutral in their high-frequency response--much more so than most competing brands--and very low in distortion.
So many condenser microphones are designed to sound artificially bright, and/or to have audible levels of distortion, that many people assume both qualities to be inherent in condenser microphones. Their ears have become so accustomed to hyped-up sound that to them, a microphone with low distortion and essentially flat response sounds "dark" to them by comparison.
But no form of deviation from flat response and low distortion can always sound good on all material. Microphones with built-in sonic coloration inevitably complement some recordings and harm others. A microphone with very low coloration, on the other hand, is adaptable to a wider range of situations, and the results are more predictable. So this is a matter of attitude as well as technology.
I'm a classical engineer and your mileage may vary considerably from mine, but the above expresses a lot of what I like about Schoeps mikes: They tend to "remove themselves from the equation" about as much as a microphone can.
--best regards