That was me a few years ago, and the reason I commented is that I found the “upgrade”/sidegrade disappointing. My experience tracks @generic, except for me it was the Clears:
I bought the Clears after 5 years of the drumbeat of “like the HD600s…but BETTER,” which I kept getting in my inbox when Headphones.com got resurrected and then heard repeated by others online through the years. When, for pandemic reasons, I found myself wanting a better headphone experience and bought the Clears blind, I got rid of them shortly after because the vocals were not only deficient compared to the HD600s, but also irritatingly tizzy with overall more coloration.
I’ll take sins of omission over commission. YMMV. What I should’ve done is just change my HD600 pads, and then maybe buy an OTL amp.
Another part of the problem for me was expectations. They just sounded totally different, with opposing strengths and weaknesses. The comparison I would make is that the Focals present like DD versions of Audeze, and eventually I bought the LCDx to scratch the itch I got from what I liked about the Clears.
If the Focals are fried rice, then the HD600s are just plain rice, but artisanal, new year crop, Koshihikari rice. If you wanted fried rice, the former is better in every way, except the rice, which tastes weirdly metallic. Sometimes good rice just wants to be alone.