I just received the DT990 Premium 600 ohm and though my impressions are still in the very early formative stages, they are not like the DT 990 Pro at all and are much more to my liking than the Q701. The midrange is much more defined and present and treble less grainy than the Pros I had and in fact the sound is much more open, dynamic and coherent it is night and day between these sister models. I even feel the soundstage on these is much larger than the Q701 and I already thought the Q701 was the biggest possible. More than anything, the DT990 Premiums do not have the upper octave roll off the Q701 has which has been my biggest pet peeve with them since day one, but seem to reach effortlessly to the uppermost shimmer of cymbals and air of vocals. This isn't official but the DT990 Premium 600 ohm will probably take the throne as my favorite and most used headphone from here on out.
Edited by Hifihedgehog - 4/14/14 at 12:57pm