MR is a bit warmer. I think more bass, not more texture or detail but a bit of a bump. It still has good texture and speed but the DZ definitely edges it out. MR can still hit tho when it’s called for. Mids on the MR are beautiful imo. Absolutely loved them. DZ seems to push the stage back a bit but I didn’t find the MR too intimate or anything (many perceive this differently tho due to ear shape etc.). Highs to me were just about perfect (didn’t like HEKse FWIW, too bright for my tastes). I like a bit of sparkle but nothing too offensive.
I felt comfort was great, didn’t mind them at all. I had the version without the strap. I’m sure the newer version is even better (like the DZ, it was comfortable). And FWIW I liked the LCD 2.2 too. They’re not the same but MR has a bit of warmth to it for fun listening. It was great off the tube mini. And I liked the suede bass ported pads. You could get away with non ported tho.
Edit: I only tried the DZ off the Stellaris, tube mini, and MJ3. It probably could have scaled a bit more on something like an AIC but didn’t have it then. Maybe that’s why I thought the MR was close enough.