I find the search for a top notch closed headphone really frustrating TBH. It's like an eternal quest. I owned or extensively tested these ones so far (in order of personal preference)
Focal Elegia: My favorite closed headphone to date. For closed back, large soundstage. Very neutral, but mids can be a bit metallic and the whole experience a bit lifeless sometimes.
MrSpeakers AFO: One of the best I have heard, but low end can be a bit shy.
Denon AH-D 9200: Had my money on this. Alas. Unexpectedly, very different from the 7200. Very bright. High resolution and neutral, except for the hot trebles.
Denon AH-D 7200: Also a good one. Slight tonal imbalance / highs roll off and the arrival of the 9200 made me sell it.
Beyerdynamic T5p Gen2: Pretty good headphone, quite neutral, except annoying mid bass bump (why I sold it).
Sennheiser HD820: Versus the huge expectations, this was a bit disappointing. Quite mid-bassy (which I hate).
Sony Z1R: Impressive build and bass, but far from neutral, veiled.
Audeze LCD XC: Mwah, does not excel at anything. You need strong neck muscles to keep up the weight.
Denon AH-D7000: Honorable mention, due to its age. This was cutting edge at the time, but nothing special today.
B&W P7: This might surprise, but especially for the price, not bad. Quite neutral. Much better than the P9.
Sony Z7: Little brother to Z1r, similar sound signature, but on a lower level. Bath-tub syndrome.
Fostex TH-X00: "Fun" headphone, flabby bass bleeds into mids and highs can be sibilant.
Fostex TH-900: Even funnier. Earth shattering bass, but the tonal balance, what were they thinking....
No closed headphone that I was completely sold on yet. So what now? Focal Stellia (waiting for price to drop)? Waiting for a MrSpeakers Ether 2 C if that ever comes out? Waiting for a closed Hifiman (lol)? M1060c?
Any other contenders i have missed?