What I'm trying to say is that the HD800 is very neutral, clear and unforgiving compared to say the PS1000 IMO.
I'm not very familiar with the terms but I would say the PS1000 is more "musical" or has more of a personality if you will.
I didn't really like the PS1000 tho, which is why I am looking at the possibility of LCD2/LCD3
I don't like the HD800 when I listen to classic rock tracks like AC/DC, and some tracks containing female vocals sounds a bit off (basically high cymbals and S-sounds, which I'm assuming is that 6k peak showing itself).
For everything else the HD800 is by far the best headphone I've ever had/tried and I spend hours enjoying it every day :-)