Haven't tried it, the price/looks/lore was a bit of a turnoff. Seemed like an overpriced edition for the Asian markets that are buying anything regardless of value.
So you like it? I'm a big fan of holographic spacious signatures, with a lot of air, lots of room but keeping good positioning/separation and tone.
Have you listened to the CA Andromeda? If so, I'd be very curious to know how the two compare. I'm a big fan of the Andromeda, it's the HD800 of the IEM world to my ears, but smoother and more voluptuous.They can sound so wide and spacious, I love it.
If the IER-Z1R can go beyond that, would definitely check them out.
My last R10 listening was ages ago, I can't recall much anymore. These days I doubt many are still in good shape, you seem to have one of the few exceptions. As for the Z1R midbass, can't say I disagree. They can sound a bit too bloated with some masterings. Not extreme as the 1000XM3 or similar, but a bit too strong. I would have tuned them a bit flatter on the lower end and added a bit of brightness. Still, pair then with the right tunes and they can sound perfect. Full and extremely fun.
Z1R aren't a good choice for anyone wanting a single headphone IMO, but if you have the space/funds for more than one, they're excellent when paired with the right content. And in build/comfort, are still my favorite overall.
To be back on topic, Haven't heard the Z7mk2. I really didn't care much for the original Z7 sound at all, so didn't even check them out. Assumed it was... even worse.
vs a Z1R also doubt I'd be happy, but who knows. They might have good value and a different tuning from what I assumed. I'll see if I can checkout a pair, you made me curious.