Got the opportunity to visit a great audio stor today, that let me bring my HEKS with me to compare against the models they sold. My main objective was to listen to the Sennheiser HD800S, as I've heard so much about it and it's fantastic sound stage.
The personal had prepared the Denon AH-D9200 for me to listen to as well, as they wanted me to hear what Demon's flagship model could offer.
Honestly, I did not spend that much time with the Denon. It is built very nicely, but the sound was lacking compared to the HEKS and HD800. It sounded "compressed" and small, and the tonality was a bit off to my ears.
Quite disappointed with these to be honest, at least in terms of sound.
The HD800 is a very exciting headphone IMO. Very well built and extremely comfortable, it made me realize that my HEKS are not as comfortable as I thought they were. The soft pads and light weight made a much larger difference than I thought it would.
The sound was great as well. Tonality was not as good as the HEKS, but much closer than the Denon. Soundstage was, of course, amazing in size. I really liked that a lot, and something I wish the HEKS could offer as well. But from what I had read and heard beforehand, this was expected. I also expected a pretty clear lack of sub bass, but was actually surprised by not really missing much in the bass. I could live with the HD800's bass, especially if it got a small EQ tweak.
I do feel the HD800 came up short, compared to HEKS, when comparing the depth of the sound stage, the separation capabilities and most importantly for me, the ability to "render" the instruments playing in detail in front of me. Not sure if that is what is called "details" or "resolution", but the HEKS was clearly better here.
So while I really liked the soundstage size, built quality, comfort and general feel of the HD800's, I'm not selling my HEKS. They are overall better for my preference.
The HD800 is around $1900USD, and at that price, I won't add them as part of a collection. However, I would like to own a pair at some point, as I'm sure I would enjoy their special capabilities in some cases. So I'll start keeping an eye on the second hand market
Anyway, just me little experience comparing the HEKS to a few other high end models out there.
Edit: Forgot a question: Have any of you stretched your HEK to loosen the clamp on them? I found that a big part of the reason the HD800 was more comfortable was less clamping force, so I want to lose up the HEKS if possible?