I've heard a lot of fine audio and the Qualia still baffles me. I typically HATE gear that sounds "super fast and detailed". That usually means bright, analytical, sterile, and generally unlistenable. Yet the Qualia is truly different. Probably my favorite headphone, despite the midrange weirdness -- after a short while my senses would adjust, and then they were capable of rendering the least headphone-like sound I've heard from headphones. They're the most resolving headphones, too (I could never quite get into the electrostats) -- and yet, super-musical, like lots of the overly warm gear (L3000, DX1000, RKV Mk II), minus the actual warmth. I liked them with everything from classical to hard rock. Sure, the R10 mids were better (it's hard to beat magic, and I'm a midrange-centric guy)...but I thought the 010 highs were a touch better and the bass was FAR superior.
I felt that the HD800 sounded like a poor knockoff of the Qualia -- really, a bad joke.