Had a 3-hour session with several STAX models (L300, L700 and SR-009), LCD-X, HEX, and of course Elear today. Using Chord Hugo as dac/amp (used a STAX for the stax obviously).
After listening to all of the above and quickly going back and forth to Elear for reference, I walked out of the shop and am still able to very much enjoy my Elears!
Some short impressions if anyone is interested:
The Stax had great imaging and layering. Electrostat-treble is something truly special. There's more treble, but at the same time less... what I mean is that the treble is more detailed, more resolved and present than on any dynamic or planar I've heard, but still it's never piercing and even less fatiguing than Elear's treble (or any other headphone really). I never found them lacking in the bass either. None of the Stax could match the engaging dynamic punch of the Elear though.
L300: Tonality the most neutral of the bunch. Soundstage is narrow and shallow (what some call vertical soundstage), yet there's some airiness to the sound due to the electrostat-treble. You'll never find normal headphones with this kind of resolution at this price point. (This was the only stax I used with a SS-amp which may contribute to why it was the most neutral. I used the small stax amp with this, and a bigger hybrid-amp for the others).
L700: wider and deeper soundstage than L300. Treble is more laid-back, but yet they're even more detailed than L300. Some weird coloration in the mids, I actually preferred L300 for vocals. According to the guy in the shop it was mainly because of the hybrid amp, but the 009 sounded completely natural on the same amp?
SR-009: Hard to describe these, especially after such a short demo. Didn't really pick up on anything, they just sounded RIGHT. Clarity, resolution, separation out of this world. L700 had a more distinguishable character.
LCD-X: Not that different from Elear overall. More hazy in the mids and highs, Elear feels more resolving and is definitely more airy and sparkly. LCD-X sounds veiled in comparison imo. LCD-X has that awesome Audeze bass though, fast, clean, powerful, never-ending depth. Soundstage is of about the same dimensions.
HEX V2: Already found Elear superior to HEX in my last A/B, and again I came to the same conclusion. Yes the HEX is more spacious in soundstage, but other than that I prefer the Elear. More full, satisfying, punchy engaging sound, and sounds more natural and realistic imo.