Well just got my T1 minutes ago. My first truly high end can (all others listed below).
And, well, right off, like after ten seconds of listening, I found them dark! Mind you I'm coming from the Shure 940's which have been my main can for a year or so, but the lower mids sound dark, even resonancy. I immediately switched from my HF-1 to M Stage (but I will be switching around between the two before I decide) to get rid of any warmth (muddiness).
But...I can definitely tell these are the superior headphone to all I have owned heard, just a more sophisticated and nuanced/subtle sound with more realism than I've heard from a can (I'm really hearing a lot of air/separation around the instruments...they remind me of a great speaker in that way). And I'm well aware that I can just be adjusting from the artificial bright/leaness of the 940s. Also there are highs here, even sibilance (I'm currently listening to bright/fast rock and pop...many test songs); it's just that there's something about the lower mids I'm not liking...yet (probably 10 minutes after I post this I will have adjusted to the different sound!). Everything else is great to impressive though...and it's nice to have some bass again!
It's going to, of course, take me days/weeks to fully absorb these (what is referred to as burn in which is all psycho acoustic) with dozens of genres and hundreds of songs a process I'll surely enjoy.