I received mine earlier today and have been letting them burn for the past 8 hours or so.
So far I find them to be more balanced than the other recent portable cans I've purchased. (COP, Momentum, UE6000 and a couple I've had for awhile, L1, MixMaster)
First off these are very light and are more minimalistic than what I thought looking at the pictures. They are comfortable but the pads get warm after a little awhile. Build seems nice. It doesn't creak or make any noise that I've heard for being mostly plastic. The outer cups seem like aluminum to me but I don't know. They look stunning in person, one of the best looking cans I've ever seen. ( I ended getting the silver version)
Bass seems tight and controlled. I don't hear much sub-bass, it's mostly mid-bass (which I normally dislike but Sony seems to have blended the bass quite well with the mids and highs in this headphone. I am not disappointed by the bass one bit but I do wish it reached lower.
Vocals are forward but not too forward. Positioning seems almost spot on from what I've heard so far. I can annoyed when vocal have that in your face type of presence but I don't hear it.
Trebles seems to be right on with decent sparkle and never nearing any sibilance or being aggressive.
Soundstage on these are better than the other headphones mentioned. It has perfect width and depth. Not huge but the instrument separation is very good. It has the best 3D layering of all the portables I have.
Just wanted to do a quick summery but I might get into a more in-depth comparing with other headphones after I've had these burn in for a couple more days.
Also, it sounds great with an amp but performed very well straight out of the iPhone.