Very nice review/comparison.
I was also in a similar search for a very good closed circumaural,for portable use.
I ended up choosing the MDR 1R. (I also own shure 840 which I love it's sound but it's not so portable,and krk kns 6400,which also looks a bit weird on head.I owned K550 too which I though it sounded really nice,but returned it due to some built issues.)
It would be very interesting to hear your opinion on 1R,both amped and straight of the iphone,compared to the UE 6000 and momentum.
But be carefull because it needs many hours of burn in. 4-5 hours of burn in are not enough.
So it will be also interesting to hear your take on these,before and after a burn in of 100+ more hours.
Edited by john53 - 12/10/12 at 6:22am