Am I the only DT 1990 owner here?
Anyways, amazing pair of headphones, in my humble personal opinion, better and more resolving than T1 but not as full bodied and authoritative, in most cases, as the T1 unless you pair it (DT 1990) to a good amp like say HA-300 then it will open up to be full bodied holographic and have ultra precise imaging.
Would highly recommend to fellow Beyer owners wanting to upgrade.
Best part: Comes with 2 earpads, Analytical pads for a more neutral analytical sound and Balanced pads for a slightly more full bodied bass heavy sound.
I personally always use A pads, it has a more precise imaging and better linearity and extensions on either ends.