I would agree about the differences between consumer, pro-audio, and enthusiast.
Gearslutz is one of the more popular sites for pro-audio. Here are their lists of headphone picks under $200, and over $300, selected by members of the site. These are from 2016 and 2017, so they're a little out of date now...
https://www.gearslutz.com/board/best-studio-gear/1103860-best-studio-headphones-under-200-a.html
https://www.gearslutz.com/board/best-studio-gear/1165278-ten-best-studio-headphones-over-300-a.html
There's some interesting info in the comments as well on these. Several members mention the AudioTechnica R70X as one of their favorites, for example. If they did some new updated lists, I suspect there would be some changes or additions on both lists. The AKG K371 might also receive at least some mentions in the under $200 category.
The Beyerdynamic Custom One Pro Plus is similar to the semi-open DT880 btw, except it has some adjustments for bass extension and tonal balance. It's sound sig is not generally as smooth as either the DT-770 or DT-880. And headphone EQ-ing has become more commonplace in recent years. So I suspect some may now prefer the DT770 with some EQ-ing to tame its brightness in the treble over the Custom One Pro Plus. The Beyer studio HPs are also known for changes in their tonality as their pads wear. So some adjustability, or an extra supply of replecements pads, may be advantageous with their DT product line (ie Custom One, 770, 880, 990).
Issues such as isolation, comfort, durability and reliability may be just as important, if not more so than the SQ on pro audio HPs. (Though I have to say that the AT M50 is one of the
least comfortable HPs that I've ever put on my big head!)
More Gearslutz top picks for other gear (including some studio loudspeakers), in case anyone's interested...
https://www.gearslutz.com/board/best-studio-gear/