If the Blue Hawaii drives the SR-007 I and II better than the Aristaeus, which I assume is true, I think I can safely say that the MkII is arguably the best-sounding electrostatic headphone. Yes, better than the SR-Omega or HE90.
I'm on the list for a Blue Hawaii SE and am also waiting for an SP ES-1. I believe Justin has indicated he will be bringing a BHSE and SR-007 MkII to CanJam. The lucky people who will hear that system better hang on to their wallets. I would feel confident betting on that system vs. any single-ended dynamic system.
I've always liked the Mk I's precision imaging and ultra-clear separation. Each note and sound source is so distinct that I don't mind its relatively small headstage as much. But the Mk II seems to me to have a bigger headstage than the Mk I, and, incredibly, even better imaging and separation. It is so precise and clear that I think the SR-Omega, HE90, HE60 and 4070 all seem a bit muddy and blurry in comparison.
Tonality seems close to perfect to me. Just very slightly dark, and very slightly brighter than the Mk I. Refinement to the max. Bass quality and quantity is near L3000 level, which basically means it's among the best bass I've heard.
I think the Mk II ranks in the top three in basically every category I can think of, refinement, soundstage, headstage, imaging, details, tonal accuracy, tonal balance, extension, bass quality, bass quantity.
If this post sounded like a rave, yeah, I guess it is.