Milabs are great mics for rock recording. A buddy of mine runs them next to my Schoeps frequently. My only knock on them would be the "active" system is less convenient in terms of not having the mounts, cable options, etc. that the Schoeps do. Of course, they cost like half as much.
What Schoeps to buy really depends what you want to do with them. Remember that none of these mics were made to record rock concert PA systems from 100-200 ft away like many people here do. Looking at the Schoeps guidelines is to a degree somewhat meaningless, because what we do (mostly amateurs recording rock concert PA systems) is sort of the equivalent of taking a Porsche and using it to drive at 15mph around your gated community.
Even the supercardiod MK41s are designed for use at much closer distances than most of us are able to record at. Much closer. The notion of using wide-angle cardiods (22s, 21s) at a distance, having tried it myself more than a few times, borders to me on ludicrous.
From practical experience, if you are rarely up very close (and for taping purposes I'd call that 50ft or less max) and your rooms aren't great, I think the MK41 would serve you better. If you stealth and can get up close, or you record in nice-sounding rooms with great acoustics, then the MK5 is a better option. I disagree that the MK5 is more versatile for rock music taping, in that while it is an outstanding sounding capsule in a good room, the MK41 will outperform it in a bad one, and the MK41 is not significantly worse than it in an up-close situation either. I believe there is even a comp floating around here of almost every kind of Schoeps being used to record onstage jazz, and even in that situation -- which would be one where I'd reach for MK5s or MK21s (if I owned them) -- the MK41 still sound pretty damn good.