How would you compare the Z1R with the HD800, assuming you've had experience with based on your signature? And is the R10 as legendary as people say?
Oh, I've had many posts on those exact comparisons. It's been a while, lazy to search back. But they complement each other amazingly well.
Those babies are two of my top favorites.
The R10 were indeed quite legendary, not only in terms of sound but also in the way it was presented to the public. Box, materials, most of it was top notch. These days I think they're more legend than fact, as most biocellulose drivers degraded heavily after almost 25 years. MDR-CD3000, Qualias, lots of dead biocel drivers, they literally rotted over decades. They now sound harsh, with really bad raspy bass. I had some CD3K near to that edge.
Z1R was the first Sony I thought that could come close the the R10. Build quality is better, drivers are great, presentation is pretty decent, but the tuning could have been a bit better. They're slightly too voluptuous, a bit heavy on the lower frequencies. Amazing detail, amazing comfort (better than the HD800, which are already great at it) but sometimes a bit too meaty, like a heavy red wine. Super fun tho.
The HD800 are different. More airy, lots of space, great positioning and separation, like the Z1R, but with a brighter sound, which makes them seem a bit more revealing, but also more fatiguing and often sounding thin on the lower end.
Both are super detailed, but the 800 are a bit more spacious and the Z1R are a bit more fun, meatier, but darker (and much better built).
These two combined are my favorite combo after a few years of use. None is a 10/10 by itself, but if you have them both on your desk and pick the right one for the right sound, it's a combo you cannot beat with a single headphone, regardless of price. IMO. Z1R+HD800 (non-modded) remain my current fave "headphone". I have many posts comparing them, probably because I like both but couldn't live with just one of these. Yet, both combined are my current listening reference, regardless of price band.