Have not heard the DT1350 yet.
How would they compare to the T1? [I did not like the T1, despite my having tried, and rather desparately, to like them. In fact, after Beyerdynamic released their "Premium" series in 2005, I thought their product line had begun to tumble downhill. They lost the seemingly endless HF and LF extension and settled for the "blah", mass market in-between. Everything in their Premium DT series, after the triumphant DT880/2003, sounded rolled off and confined by comparison.]
I almost pulled the trigger this evening on the Oppo PM-1, but thought better of it. From what I have gathered from the many reviews I have read so far, they will probably sound rolled off in the HF to me. The Oppo BDP-105--with all-out EVS mods--now THAT's a different story! : )
Just had a grand listen to bhazard's stock set of Mikros 90. Superbly balanced! The best stock sound I have heard from any of the  stock pair I have auditioned so far. And in some ways more resolving than either of my modded pairs.
Did a quick a/b between the DT990/600 and bhazard's stock Mikros 90: Lee Rittenour Collection: 24th Street Blues and Waltz for Carmen. The Beyers--at least in my ears--were handily beaten across the board: treble/bass extension and resolution, detail, midrange clarity, "naturalness", spatial realism--you name it. The DT990/600 will be up on the FS board quite soon.
I still don't miss the HE-6 (in the least).
The only headphones I have an inkling to audition right now are the AKG K812 and/or the Sennheiser HD800.
OR the Martin Logan Makros 100 circumaurals. : )
Edited by pataburd - 5/10/14 at 9:14pm