I have to try the Beyer some time. Agreed on the Sennheiser ergonmics - and the price.
I can't stand the Sonys. They're specifically designed for tracking & editing - all that screech points up Bad Things Happening. But they fatigue my ears.
Laugh now, but I landed on the Koss KTXPRO1 ( which are $20 to $40 ) and have basically stopped looking :) Most comfortable thing I've ever used and they're actually pretty flat, except for a little bass bump and a smidgen of upper mid. I think I'm on my tenth pair. They're a bit too light weight - if you catch the cable on something they'll fly off your head.
And yeah - I bet the $500 vs $20 figures into my perception of things.
I can mix on 'em, at least to the rough stage.