Short summary of HD6000 and pro80 comparsion :
- pro80 are delicate
- hd6000 have more bass (kind of immersive, but i think that it dimished a little with time), and slightly more treble
- the quality of build of hd6000 is amazing (however they are not for persons with large heads, similarly as pro80)
- hd6000 has amazing sound separation from the outside world, you cannot basically here persons making conversation nearby, and basically, you can put the volumn quite loud, and very little leaks out
The one imprefect thing is a narrow sound stage, with that sound quality you would like it to extend further out of your head.
I like the delicacy of pro80, and I actually use them a lot (in work); hd6000 were kind of left in my house, where I use have more confortable headphones (for larger heads and open); so I've actually never compared them side by side.