over the years i've used mk4, mk4v, mk41, mk21, mk2S. overall, if i had to choose one single set of caps, hands down would be the mk41. they really are usable in any situation. yes they have slightly less bass than you'd get from mk4 and the sub-card varieties, but the bass is still very smooth and full (plus you could always add a bit in post). i find the benefits of their directional properties more than outweigh the slight con of a bit more bass rolloff. Plus, as with any directional schoeps capsule, they are very smooth off-axis.
for the stuff most of us record, i find the mk41 does the best job at eliminating what we don't want to hear (chatter, reflections, etc). i've found it's the best choice for use in sub-optimal settings, and still shines even when used onstage, or in a perfect room in the sweet spot.
Another potential benefit to consider, for PAS-style setups, which are typically going to be smaller mic angles, the mk41 allows you to run those smaller angles with less spacing between mics than a comparable cardioid (i.e. at the same recording/rendering angle, see the ol' stereophonic zoom paper for more on that).
you might find this prior shoot-out post helpful...
http://taperssection.com/index.php?topic=116906.0have fun