I wouldn't advise people to set up a pair of MK 41 V capsules directly side by side (or the MK 8, either). That kind of arrangement is considerably more successful when the MK 4 V (cardioid) capsules are used, which is how the CMXY 4V stereo microphones are arranged. But these "vertical supercardioid" capsules seem to interfere with one another when they are immediately adjacent to one another. A few years ago I tried it a couple of times, as did some other people, and none of us were very happy with the result. This is why Schoeps doesn't offer a "CMXY 41 V" stereo microphone.
I would either separate the capsules by an inch or more in the horizontal plane (which of course is no longer strictly X/Y, but for most people a good-sounding stereo pickup is more important than perfect stereo/mono compatibility) or else place them "head to head" one above the other.
--best regards