I used the T1.1 nearly exclusively since I got mine February 2018 because the match of a warm tilt with a wide resolving headphone matched perfectly.
I have just got my hands on a second hand mint set of HD800 and again its a hell of a match, everything just sounds so right across the frequencies. The sound stage is holographic on well recorded material, vocalists singing out in the room suspended middle between the instruments like a well set up near field speaker rig is playing to me, in love with this