Focal Clears were the first high end headphone I'd ever had, and I currently have the LCD-3. Though the Focal frequency response curve appears neutral, I had found the former headphone's lively, brassy character to be fatiguing with certain types of music; percussion especially so. There's things I hadn't tried, like injecting a small amount of second order distortion to try and warm them up, or using them with a tube amp. The Clears and HiFiMan's Aryas do offer more microdetail than the LCD-3 or the LCD-X; the texture I had heard with stringed instruments is only half there with my LCD-3s. Still, the music is presented in an enjoyable way and I will keeping the LCD-3s for a while. I find with hard rock and metal, hearing every last detail in the music, just isn't all that enjoyable.
I just played some techno music (The Crystal Method), and the area below 100 Hz on the LCD-3s is so hefty and low distortion that it sounds like mortars going off.. I am now hearing bass on certain songs (well, all of them on Legion of Boom) presented in a way I had never heard before, with any conventional speaker setup, including my low distortion servo enabled Rhythmik subwoofer and Martin Logan tower speakers (both excellent in their own right). I believe, the following is going on:
1. Resonant peak at 80 Hz, and half wave frequency response spike at 120 Hz
2. Phase shift
3. Undesirable room effects including a low bass null that you can't repair by boosting it
4. Cancellation nulls due to the tower speakers and the sub interacting
5. Distortion rising below 150 Hz on most any conventional speaker setup (most of it masked by the music and not audible like it shows on the charts)
HiFiMan Arya soundstage and imaging is something, to the point of being unnatural (like hearing instruments above my head). That headphone, needless to say, lost in dynamics to the LCD-3 (the Ananda and the HE-1000 probably sound "thin" too). I had noticed kick drums hitting with a satisfying thud when I had tested the LCD-X's in 2018, like no other headphone in the ten or so I had tried.
I've never heard the pre-fazor model, only read that it was warmer and more midrange oriented than the new model, but had less clarity.
I have LCD-3's from 2017, and with my ears being sensitive to treble, I find them perfect for me and would describe them as well balanced and neutral. For example, Focal Clear, Utopia, and LCD-4's were too bright for me. LCD-X was also just a little too bright for me, while not as revealing as the LCD-3's.