hmmz hopefully ull be able to find someone who has heard both, I own the M50 and i dont have any complaints about it. Im just barely now growing fond of trying open cans, but for a closed can the sound quality is excellent. I think the bass is definitely its strong point as it can be very boomy & hit hard if the song calls for it. , but some of the highs are pretty impressive as well as they seem to stick out alot as well in certain songs often leaving a smile on my face. I think the mids are more neutral sounding but the clarity is still there as they are designed for studio use after all. I often use mine with my Bravo Tube amp even at work. Amped these cans seems definately have a fuller bass hit, /slightly punchier bass & better sound which imo is even more welcomed. & the highs seem even sweeter sounding, but that could be in my head,heh. I do not at all think the bass is over powering at all tho unless comparing it to that of an open can then then some may claim its a bit over powering, but i really couldn't imagine not having the strong bass. Every other person that ive shared my phones with had nothing but positive things to say about them, ofcourse most of these people just use regular ipod buds,lol. Oh and if anyone tells u the m50 makes their ears sweat then they are just picky trying to find reason enough not to enjoy them, Very minor issue imo, they wont leave sweat dripping down your neck.
I listen to alot of trance/techno, Rock,alternative, & lil bit of hip-hop So that is what im basing my experience off of.
:my 2cents