Finally ended up selling all my other cans with the exception of my Beyerdynamic T1.1s (not worth enough to lose such a classic can, they're still my second fave) and my AKG K545 (wife uses them for portability), since for months now all I ever end up going back to is my MDR-Z1R's.
At first I thought I'd switch to my HD800S, HD800, LCD-3 etc dependant on genre of music, eg HD800S/HD800 for orchestral or classical, and LCD-3 for RnB, Hip Hop etc, but I'm just using the Z1R's for everything since they're so damn emotive, balanced, tonally accurate, non fatiguing and musical, including for gaming, hence not seeing the point of holding on to the others.
The main reason I kept the others was for curiosity and comparisons sake, but ultimately I think the Z1R is my final end game, it just works for pretty much everything. For me at least, based on everything I've listened to over the years, the Z1R's are the best headphones I've ever heard.
Whilst I listen to cans like the HD800, HD800S, T1 etc thinking they all could do with a bit more bass impact and/or warmth, and I listen to cans like the LCD-2, LCD-3 etc thinking they could do with more definition, air and a wider soundstage, I listen to the Z1Rs and don't feel I'm missing or wanting any particular thing or aspect of the sonic signature. If you asked my how I'd tweak their sound signature to improve them, I honestly couldn't tell you. I don't have any EQ profiles for them on any of my devices, apps or players, because they simply don't need one. They're slightly on the warmer side, sure, but only enough to be less fatiguing and more atmospheric, not enough to be slightly dark, cloudy or less wide sounding like certain high end warm cans, nor as shrill or harsh sounding as other V shaped high end cans.
In many ways the Z1R's sort of sound like a HD800S with more warmth, smoothness and a fairly notable amount of added bass impact (especially sub bass), which for me is pretty much ideal.
It's surprising and refreshing to have a warm, relatively bassy can like the Z1R that still manages to retain such a wide soundstage, coupled with a potent level of air, articulation, detail and imaging, whilst still being non fatiguing and/or inoffensive. Best of all, they're closed so you get minimal noise bleed and interference. I'm listening to mine as I type this right now and my wife is asleep right next to me!
Kudos to Sony for finding that magic balance.