MomijiTMO
Headphoneus Supremus
Depends on the T1 actually. I've heard T1's brighter than the HD800. Where the 800 can have a peak at 6khz that makes treble sound harder, the T1 can have a mountain from 7-10khz which to my ears is actually worse than the 800's raised plateau. There is significant enough amount of variation among T1's to really know how bad it will be for any particular listener. A T1 with boomier midbass and less reccessed 1-3khz in the mids also helps to mitigate some of this comparison to a bright sounding HD800 too. Not to mention people who plug them into all sorts of interesting gear.
One of the two was.... farking horrible. The other was a lot better but still bright to my ears (on that rig). While Beyer seem to have a bit of an issue, it's a problem shared with many manufacturers. Maybe not to the same degree...