You are right. I have to correct this.
The Hifiman IS more resolving. At first I was not sure if it just because the Arya is a little brighter. But i listened a lot yesterday and i have to say, the LCD-X is for sure not there in terms of Details. What confuses me a little is the fact that i can, with the LCD-X, recognize better what changes by using Upsampling/DAC-Filters/Tubes etc. on the iDSD/iCAN. Its way easier with the X. For example, with the Arya, when i use tube mode, i am not missing that much as i do it with the LCD-X. Tubes are warmer and not that resolving, but on the X you are lose more, as on the Arya.
Highs on the LCD-X are a little rolled of, compared to the Arya. For sure more detailed on the Arya.
Mids on the LCD-X are warmer and more natural. On the Arya they are clearer and more detailed.
Lows on the LCD-X is something i never heared on anything else like it. The details and the resolution in the low end on the LCD-X is very impressive. Very defined low notes, you can actually notice the smallest differences in the low notes with the LCD-X very easy. Something even Audezes own LCD2/3 dont shows on this level.
The X playes more dynamic, it invites to more active listening and by doing so, you get rewarded with every little tonal change there is in the recording. It pulls you a little into the music, into listening to the music. The Arya plays clearer and a lot more detailed, yet a little boring. I dont quite get that grove for the track like on the Audeze. The Audeze is more musical and at the same time more analytical. The Arya is clear and resolving like nothing else, it got its own magic, yet not that magic i got from the X.
Englisch is not my native language, i guess one could tell that for sure. So its hard for me to describe, what i am struggling to describe in my own language.
LCD-X is more like listening to studio grade loudspeakers/studio monitors. The Arya is more like listening to very tall and big hifi grade loudspeakers. At least thats how i would characterize them.
I dont feel i get the most detail by listening apod on the Arya. I feel bitperfect is the most detailed setting for the Arya. The Hifiman is so clear, i think he dont likes apod very much. On the LCD-X, i can confirm what you are saying, apod filter could be the best for details with the Audeze.