not really, IMO. they share the same sound signature. and im not sure if that would actually be an upgrade since the ES7 has almost the price range as the m50. how about a used ESW9 in the FS section hahaha..
not really sure if there will be an upgrade with your ES7 in terms of clarity. or you can side-grade to a different headphone with different sound signature (less bass, more details and clarity) at your price range. not sure if there is one though.
you can try selling your ES7 to someone you know, add a few more, and get yourself a nice pair of used (or new) DT1350 or T50p. http://www.head-fi.org/t/610344/beyerdynamic-dt-1350-and-t50p-priced-to-sell
you can have your ES7 recabled though, if you feel like doing it and see if it will fit you. i have a friend that has a modded ES7 and i can tell that it really sounds different from the stock, less bass but accurate, forward mids, clear highs.
not sure what dampening scheme did he use though...
Edited by Dyaems - 5/24/12 at 4:45pm