Best sounding headphones you have owned?

You know, it is funny… I keep thinking it would be my Focal Utopia… but it is my Sennheiser HD800’s that I listen to by far the most… 95% of the time. I seldom listen to my Beyerdynamic T2, Audez LCD 2, Ultrasonde Edition 9, Denon 9000 (?)… or my other ones… Grado, ADG, Ultrasonde, etc… wow, I have a lot of headphones..

I think the Focal Utopia bested the Sennheiser until I upgraded the electronics to a tremendously powerful, natural, tube head amp.

Quad ERA-1

Stax Lambda SR (non-pro) here, I have been using them for about 30(!) years and although I have tried many others, nothing comes close for overall SQ.  I like the Utopias, especially for bass, but anything acoustic on the Stax is just amazing.

I've had a lot of TOTL headphones come through here, including Abyss, ZMF, Focal, Meze, Audeze, and others that are slipping my mind, but the winner for me is Susvara through my Eddie Current amp.  I do use Utopias with my DAP though...

I own and use STAX 009s and Audeze LCD-XC headphones. I recommend both highly. Two of my favorite phones from the early years are STAX Lambda Signatures and Yamaha YHD-1. The Yamahas were made of some cheap plastic and broke easily, but they did sound much better than their modest cost would indicate. I recently sold my vintage Lambdas, along with a tube STAX driver unit. I hated to see them go, but...