I compared these to the HD 600 and some Beyerdynamic headphones.
The sound is very detailed and wide, with excellent representation across the frequency spectrum.
However, I have a big issue with the earpads: inside each pad, there are "R" and "L" markings which are not flat. Part of my right ear touches the "R" letter inside the right earpad, which becomes really annoying over time and feels somewhat itchy. It is a bit better with the producer pads but still I am not sure if I can work with them like this, so most probably will be returning them.
Most of the users do not seem to have this problem, but there are some reporting to have same issue. Never had this issue with any other model of headphones.