Many thanks for the advices!

I've been given the opportunity to borrow the UMT and to give it a try. Yesterday we (I and my colleauge) compared it to a Shure KSM44, on a male singer. Honestly, we couldn't really tell any great sonic difference. Perhaps the UMT sounded a bit more round in the mid.
We used the micpre's in a RME Fireface. Would have been nice to run it through to a tube micpre, hopefully the UMT would have showed us it's real capacities. But a tube micpre is still on our list-of-gear-to-get...

There is a mark of impact on the top of the UMT. Seems to have been dropped to the floor... The mic doesn't yield any crackles, but might the incidental dropping have caused any damage on the membrane (which would not be immediately noticeable)? Any thoughts?