Probably not.
They are sorta between a HD600 and HD650 in tonality, but with soundstage of HD800s and unparalleled comfort. The HD800s are better, but for every day use (I use headphones 8-10 hrs a day) the MA900s are hard to beat. No chance of excessive treble bite like can occur from time to time with HD800s, and a bit stronger mid-bass for fuller body at lower volumes.
I'm not sure exactly why I like these so much. They are capable of HD800 depth of stage, but seem more direct, connecting to the music in a special way. So far I prefer X-Sabre -> Black Diamond -> MA900 over any other electronics combo (Mini-Is, M-Stage, GS-X2). GS-X2 is too rough in the treble, the M-Stage just isn't a good match at all, and the Mini-I units lack definition/detail.