I FINALLY got to hear a pair of HD800s, and they definitely live up to the hype. I only got to spend about a half hour with them, but as good as they sounded, I didn't hear anything that would make me want to ditch my T1s in favor of them. If I didn't already own the T1s and I was choosing between them, I'd probably feel that it would be hard to go wrong with either phone, IMO. If I had done this demo two weeks ago, I may have given the nod to the Senns, but now that my T1s are really humming along with some new Meier toys to play with, it's more of a dead heat. Two fantastic headphones for sure.
i cant decide which 1 i like more. T1 is very musical and works with many genres, the hd 800 also, and hd 800 is more linear and i feel the hd 800 is slightly better overall, but i still listen to my T1's more. they just sound so right (to me at least).
ive also been giving the LCD-2 a bit more attention (maybe i need to check out LCD-3? )