Depends on what the listener desires. I love midrange and don't care too much for bass, so the TH-900 easily sits below both the T1 and HD 800 for me.
This probably has something to do with why I was pleased with the HD 800 even when I heard a MDR-R10 on the same day, and not pleased when I listened to the TH-900 back-to-back with a HD 800.
But sound signature aside, I'm honestly not sure the TH-900 resolves on quite the same level as either the HD 800 or T1. It is a clear step up from the D7000 in this regard (which resolves admirably for ~$600-700), but I don't think the level of refinement is good enough to play with the modern best. To my ears the in-production sub-$2k trio are ruled by three headphones of different design -- HD 800, LCD-3 and SR-007. I hope that the next Fostex iteration achieves a level of grandeur that is not shamed by these three (or any headphone for that matter).
Edited by 3X0 - 6/26/13 at 12:32pm