Moved to the USA from Asia, but that's OT.
I have always used the K701 as my reference when looking for a new headphone, since the sound characteristics fit my personal preference the most, I bought many different headphones during that time and always ended up selling them and sticking to the AKG, that is until I bought the ATH-W5000. Now having owned the W5000 for about one year I haven't looked back since, so that is the best headphone I have ever owned (though I still own the 701 and will never sell it! I still love it dearly). Cheers,
The best headphone I'd owned is still the DT880/600. It offered the best comfort, so much so that I would often forgot that I am actually wearing a headphone. It is the most neutral sounding headphone I have as well, and was the best accompanying can whether I'm in the mood to listen to music across different genre, or even to wear it while I'm practising on my bass. It's the only headphone that does justice to the great playing of Tetsuo Sakurai.
I currently own HD800 and it is astonishing. I don´t have any other headphones to compare it with, except from a Sony MDR-V700DJ, which there is a huge difference in SQ-wise.
Besides from classical music, I also find the HD800 to work exceptionally good with movies. Far better than any previously owned headphones.