I've heard it off a speaker amp at a meet and there were experienced people who thought it sounded really good. Although I really could care less about full potential right now. Some in here would probably shoot me down for running the Mjolnir off a SE dac although a very good SE dac. A speaker amp isn't realistic for my uses and I did do some research on them but I'll stick with what I have.
I just got my Mjolnir in the mail a few days ago so it is fairly new. It will probably take me a month or longer to get enough hours for those who believe in burn in. The HE6 and HD800 are both very good. You really can't go wrong with either one. The biggest surprise was that the gain of the Mjolnir was enough where I didn't have to move the volume knob all the way up to get good volume on the HE6. It's at around 9 o clock right now. The biggest difference between the two is there is slightly more bass with the HE6 and everything is smoother.
The HD800 has been my favorite headphone for a long time and stopped me from buying and just enjoying what I have. The HE6 was an impulse buy but it will need to be really good to beat the HD800 since the HD800 suits me perfectly,
Edited by rawrster - 10/12/12 at 7:04pm