V590 Pro was indeed really great with the Susvara, playing into its strengths and not leaving a lot of signature footprint on it but some important ones (treble, lower mids). Absolute extension, delicate, slightly sweet, treble, very "tactile" midrange, slight lower mids warmth and then bottomless. Only area where I wished it went a tiny bit further was the slam and overall (transient) tactility. My blu-tack, sorbothane modded 4-screw HE-6 with ZMF Auteur Lambskin does this better but that's not big news.
Oh yes, the staging and imaging. Really love the cohesive, rounded (Hey Sahmen!) stage with a stable and solid center image. Also big and lasersharp (like the HE-1000SE but more even in the middle/center image), not diffuse. Watched The Dark Knight + Dolby Atmos with it, what a joy.
I was pondering selling a few headphones to get it and threw a lot of "common sense" overboard. However somehow I managed to withhold as it's really a lot more expensive in Germany than in the US. MSRP is 6999€ here, that's 8500 Dollars. Nobody I knew would go below 5k €. That's still a whole lot of money and I need a few more things for my setups (second DAC, cables, monitors) before a 5k headphone and I bought a lot other stuff already (TV etc.).
Also couldn't let go those headphones either as I cherish them too much. 1st world problems.
Thus I tried to make most of the loaner (2 weeks max) time and used it for everything. Tons of music, watched movies with various VSTs, played a game. Just want to say that it proved (again and this time at home) that it's my favorite headphone I could somewhat afford if I tried very hard. It's so damn good and enjoyable. Never "maxed" a headphone so much in so little time and had a hard time to let go.
Haven't heard it on the V281 unfortunately but
@Slim1970 is the man for impressions with it, also since he owns the HE-1000SE too as far as I remember.