Theres a lot of "it depends" on closed back, so heres the best i can answer:
· What do you look for in a closed-back headphone?
ath-w1000z pretty much sums it up what im looking for
(without the stupid wood on it, its the only reason i didnt buy them!).
Other than that, i guess..... clear, detailed , bit of bass, not muddy in the mids. I dont want to be listening to cymbals & hi-hats all day on them, left right balanced sound.