They are for sure different beasts, but the LCD-4 is more like a bear whereas the Abyss is a dragon.
Awesome analogy dude, rofl!
Glad you like them.
I'll echo everyone's sentiments when i say, Fit is highly important with the abyss, im also surprised you made your decision to ditch the lcd4 that fast. too me a good month of abyss tinkering to get the perfect fit.
That fit came with a small modification for me. See pictures below of the mod. The height of the abyss just wasnt right for my head, and with the lack of vertical adjustment, it was really hard to get right. With this small mod using some wirestraps. I was able to dial in the perfect height, and the headphones just opened up to amazing levels once i discovered this fit. i also have the cans slightly angled towards the front, so a small 25 degree angle or so in the hinge at the top. I've burnt this fit setup into my memory in-case the abyss is ever tinkered with by my friends
Having said that about my mod, i've heard the new short headband is also a solution for my particular problem, and i should be collecting one today to test. So i'll see how that does.
Also, the area where the cable connects to the abyss is what i use to determine the front of the headphone, as it angles the cable slightly towards the front. You don't want the cables angled towards your body.
When comes to audio, ive post many opinions about the Abyss on this thread in the past, but again, there's nothing like an abyss. All the flagship headphones have defining characteristics, but i think you've said it right, the abyss is at the top of the food chain from what i've heard, an unapologetic dragon. But there are times when i prefer something softer (certain genres of music, some games, studying, etc, you cant study whiles wearing an abyss. not gonna happen lol. HP are too engaging.) and that's when i put on the HEK. I'm glad i kept both.
Onto my music test recommendations for the abyss: (yes i know this is one long post, i just got caught up on the last 15 pages of this thread
)
Bass and Range:
http://www.hdtracks.com/bad
All the songs shine with abyss, but in particular,
Speed Demon and Dirty Diana
Violins:
http://www.hdtracks.com/the-four-seasons-the-vivaldi-album
Violins, Range:
https://www.amazon.com/Melodies-Hyrule-Music-Legend-Zelda/dp/B00I9LFZP2/ref=sr_1_5?ie=UTF8&qid=1467813292&sr=8-5&keywords=taylor+davis
Bass: (the abyss kicked my butt listening to these 2 below albums. truly amazed at the bass performance every time)
http://www.qobuz.com/ie-en/album/ptx-vol-1-pentatonix/0886444622165
http://www.qobuz.com/ie-en/album/ptx-vol-2-pentatonix/0886444622547
That's it
Enjoy your abyss, and be warned, there's a scary amount of performance left to extract when you find the perfect fit.