A while back, I made a rather non-clinical comparison of the Doepfer
SEM and Wasp filters, along with several others. You can find the
discussion here.
http://www.kvraudio.com/forum/viewtopic.php
t=212896&start=0&postdays=0&postorder=asc&highlight=

I made two comparisons- the first mp3 which is a rather short
comparison, and then a second extended set later on in the thread. I'm
not sure if the extended versions are still available online, as I
didn't host them myself at the time. I'll be happy to put them back up
on my web site if need be.