How does it compare with HD800S? And do you like them? I don't recommend these to people as these are a divider of opinions, while personally love these.
Here is a good song to "test" ADX5K imaging, soundstage and speed capabilities: Yosi Horikawa - Bubbles
The ADX5000 sounds better than the HD800S, that's why I spend money on this. I have tested them side by side two times before deciding to buy.
Enjoy the pictures:
Test I.
Test II.
The HD800S sounds a bit more dull and flat. The ADX5000 has a more alive, vivid sound. More crisp. Like a 28-30 year old woman vs a 18-20 year old young woman, if you know what I mean. Both are alive, but the 18 year old is more alive.
Soundstage difference is not that important or noticable, I am completely satisfied with the ADX5000's airy sound.
Build quality, looks, weight, materials, the ADX5000 is better.
Comfort at the moment, the Sennheiser is better, but maybe if I buy new pads, this will change. I do not like that my ears are touching the fabric. In the Sennheiser my ears touched nothing. Maybe with new pads this will be corrected.
In the pictures the HE1000SE and Susvara can be seen, I think those have better bass extension, so better sub-bass (which is an advantage, but maybe it just diverts your attention from the music), otherwise they are not that much superior to the ADX5000 in my feeling. Also very clear and vivid sound, a tiny bit better maybe, but not by much.
The Sennheiser HD800S sounds a little bit dull and flat in comparision the the ADX5000 and both Hifimans. But it's okay, since it's cheaper and very comfortable. Very rugged headphone.
I have bought the ADX5000 for 1180 Euros in my county (+50-60 euros for Dekoni pads
https://dekoniaudio.com/product/elite-velour-ear-pads-for-fostex-th900-headphones/), which is a good price, I am happy. I can sell the HD800S for roughly 850 Euros. The ADX5000 was only moderately used and excellent condition, so it's a good deal.
So I am happy. I think the price difference I pay is justified, because of better sound quality.
------------------------
If you are bored and looking for an upgrade, maybe look for the Hifiman HE1000 series, depending on taste. And a second hand one for a normal price. Better bass extension (sub-bass), maybe a tiny bit better than ADX5000. Downside is, the headphone is heavier, maybe less comfortable for you, but your ears will have space.
Only buy the Susvara if you have enough money to burn.
Depending on taste you might even like the HE1000SE better. The HE1000SE is a bit more analytical, the Susvara maybe more pleasure. But these are tiny differences I think.