I don't have an issue with music reproduction or a gaping hole in the freq range when it comes to the Arya's. The reason for getting another phone is because variety is the spice of life, and after 45min or so of listening they can get fatiguing for me. Looking for something that will give a more full-bodied sound and envelope my ears in warmth, which is admittedly harder for something as open as the Arya to reproduce. My Z7's do that to some extent but doesn't have nearly the clarity of something TOTL like the Arya. It sounds like the Z1R's do (as polarizing as they are) and are the very opposite of fatiguing at the expensive of detail retrieval in the higher frequencies.
After a long day of work using something less fatiguing may fit the bill. The cool/fun part is when you switch from something like the Z7 back to the Arya's you appreciate the latter that much more.
I found Focal Clears to be fatiguing too, and I had sold them. They have a lively upper midrange that had made me turn them down a lot with certain music (the singers were shouting at me). Cymbal hits could be a bit much with rock music, though I had admired how they shimmered (with no cheaper headphone I had tried, did they sound like that). They also have a cold, metallic signature. I hadn't tried the Utopias due to my inability to afford them.
My Shure SRH1540's (which nobody talks about anymore because they've been out for so long), cost about the same as the Z7's, and are "dark" in comparison to the Clears, and "warm" (more pleasing with some music). They don't have the detail of even the cheaper Elears, but being closed back, I like how the bass slams with rock music. Listening to "Whole Lotta Love" (having one of the most bombastic bass guitar tracks ever made), I definitely prefer listening with the cheaper closed backs. Then, once I got to "Going to California", I would reach for the Clears again. "The Immigrant Song" is lively, and I would prefer a dark headphone to listen to that one. It just goes to show, there's no "one size fits all" headphone. Lively: Coldplay's "Politik". Dark: most of U2's The Joshua Tree album. Sony headphones don't seem to get much attention either, and after all, the market isn't all about planars. To replace the Shures once I can afford it, I would probably go for... the Audeze LCD-2 closed back. Audeze bass is really good, I expect their large size and heavy weight means that they have bigger magnets, able to reproduce bass well.
I found the LCD-X sounded "dark", but warmer (the upper midrange and treble can sound recessed), and could be a good rock headphone: I had it down to that one, and the Clears. I felt that the former had lots of detail as well, but didn't have the "in your face" presentation of the Focals. 4z hadn't been released yet when I was in the listening room.