I used to own a pair of AH-D1100 for some years, I enjoyed the sound but the build quality was horrible, and I never really got used to wearing them.
Had to take them off or re adjust them every 10 minutes or so.
I just bought a pair of DT-770 Pro today because I heard beyerdynamics made some of the most comfortable headphones out there. "8 hours of listening, no problem"
My experience so far is the same as Denon, only able to wear them for a couple of minutes, 30 minutes max before I can feel them squeezing me.
Even after I take them off, I can feel the pressure for some time. I plan on returning them, unless they take time to get soft and comfortable.
I also heard great stuff about ATH-M50, but I have no idea if they are better than the DT-770 (I was told not).
Comfortability is really important for me. I am not able to listen to music on speakers, so I have to resort to headphones (unfortunately).
I want a pair of headphones I can wear for at least 2 hours, preferably a lot more. Headphones I can use for music, talking, shows, videos etc.
Exclusively listen to electronic music, so something with a good bass is wanted. I produce some music of my own, so studio monitors would be preferred,
however not a requirement at all. I maybe spend 2% of my time "in the virtual studio", so a good music experience is far more important.
I realized I maybe have to go a little higher in price for comfortable headphones. I was thinking $300 - $400, I am happy to pay that if I will be able to wear them for a long time.
Hope I covered everything.