Of the ones I own:
Audeze EL-8 open
Shure SRH-840
Bang & Olufsen H6
Sennheiser Momentum 2.0 over ear
And the ones I've listened to:
Audeze EL-8 open - more neutral than LCD-2
Audeze LCD-2F - gorgeous!!! a little more neutral than LCD-2
Audeze LCD-2 - lush!!
Sennheiser HD650 - very similar balance to LCD-2 and EL-8, great for the price
Mr Speakers Ether - impressive, but not quite in the same league as the Audeze range imho
Sennheiser HD600 - great but not enough extension in the bass area, lacks soundstage
Shure SRH-840 - very balanced but a tad forward highs (easily fixed with EQ), average soundstage
Shure SRH-940 - a tad more harsh than the SRH-840, terrible build quality
Bang & Olufsen H6 - lacking some lower mids, but gorgeous soundstage and treble response, fun to listen to, great build
Bower & Wilkins P7 - great soundstage and balance, just a tad too laid back for me, great build
ENIGMAcoustics Dharma - nice, but upper octave of treble is too forward
Beyerdynamic DT880 pro 250 ohms - very balanced, but lower treble a bit too forward
Oppo PM-3 - treble too rolled off and tiny soundstage
NAD Viso HP50 - very good, but lower treble a bit too forward
Hifiman HE-560 - dirty sounding lower treble, too forward sounding
AKG Q701 - not enough bass, unrealistic mids / soundstage
Audio Technica MSR-7 - quite nice, but very lower harsh treble
Sennheiser Momentum 2.0 over ear - treble too rolled off
Bose QC25 - good balance and noise cancellation, but quality of sound is average at best
Sennheiser HD800 - low end is far too recessed and highs are piercing
AKG K801 - same as HD800
Sennheiser HD700 - unmusical balance, didn't like these at all
Sennheiser HD280 Pro - strange frequency response, but nice mids, no soundstage at all
Audio Technica ATH-M50 / M50x - no mids, bloated bass, small soundstage
Beyerdynamic DT250 - heavily rolled off treble, terrible fit, small soundstage
Ultrasone Performance 840 - worst headphones I've heard by far, puke worthy
I plan to listen to the following:
Audeze LCD-3
Audeze LCD-X
And I'll give the HP50, HE-560, Ether, HD800 and Dharma another chance