If you do a search, there was a comp on gearslutz maybe 1.5-2 years ago between mg300, km84, and mc930. Of course it wasn't a PA recording comp but a studio comp. Needless to say I sold my old mics (peluso's) a couple days later and have been with beyer ever since. Rockin' the older 803's now, sold the 930's.
Try something different, you might get pleasantly surprised. If you don't like them, they sell really easy and it's not like you had thousands invested anyways.
my .002
to add: somewhere on this board was a comp, when I sent Shawn my mnc930's. Akg's vs. beyer (I know, not what you want). There is also a pseudo comp between 930 and km140. It just happened that way. It's on the archive. I'll try to find the link and let you listen. Both mics on the same stand, both mics ran to an oade w-mod ua-5. It was a real eye opener.