This is a personal opinion of HD800. In my humble opinion, having heard a plethora of headphones, I'm still of the opinion that HD800 is still the supreme headphone... for my ears. This last point is very important because there are preferences just as every human being looks different. You like curry, I like chicken rice, he likes pasta, etc, etc.
These are the headphones I've heard. When I said heard, I mean listened attentively even if it's a few minutes in a very quiet environment. DT880, DT990, DT770 HD600, HD650, AKG K701, 702, 812, T1, HE560, HE500, MrSpeaker Ether Flow C, Oppo PM1, Sony MDR Z1R, Focal Utopia, Elear, HD800, HD800S, Senn Momentum 2, PSB M4U2, Grado RS2E, PS500, SR325e, Stax SR-007, 009, Senn mini Orpheus HE6. Could be more but I won't list anymore...
These are headphones I have owned. DT880, Audio Technica ath-m50x, HD650, T1, HE560, PSB M4U2, Sennheiser Momentum 2, HD650, HD800.
All the headphones were listened to on my Elise and Euforia. Out of all these headphones, (besides Utopia) the HD800 is my preferred choice. It's not perfect. I don't think any headphone is but it's the best of the lot to my ears.
However I am about to introduce ZMF Atticus and / or Eikon to my stable. I'll see which headphone gets more head time on me head after 1 year. Who knows, I might be a converted bass head.