Well all I can say on the Tyll subject is I remember him raving over the 009s and BHSE combo, then a year or so later saying the 009s were 'tizzy treble' and not high end anymore.
We should all keep in mind that this is still an evolving field and the state-of-the-art keeps sliding forward. It can be a bit embarrassing to catch a reviewer commenting positively on a model and years later sounding meh about it. But it can happen. I'm sure I'd be surprised reading some of my old reviews from years ago, we all do it.
And the reason for that is that fortunately there is still some innovation in this field and new models keep surprising with improvements (in sound and other aspects like build and comfort). So today's 10/10 might end up feeling like a 8/10 or less in a couple of years. It's like loving your sports car until one day you try your coworker's and it feels so much lighter and faster. Your baseline for comparison shifts up.
Going back to the topic, I don't think MY views on the Z1R will change much with time. Been ten months now. I see them as a model that disappointed me a bit by not being as perfect as I had hoped (mostly due to the darker tuning, giving the initial impression of a veil that isn't really there, and also bass than can be perfect but can also be a bit overwhelming with certain masterings).
There are also a few pros and cons in the design, and one can't have the pros without the cons most of the time. Great separation and positioning even at very low volumes? Yup, it's there. Detail is there. Maybe it's the big-ass drivers, probably. Does that get you a super fast tight bass? Hm no, but it's still worth it. Etc, etc.
So it's not a 10/10, and it could have been a 10/10. Definitely enough work was put into it to justify a 10/10 - But it's still a really good closed model, IMHO, for some perhaps the best offer in the market at this time if you consider not just sound but build and comfort too. Not for everyone, they do have a sound signature that you either love or hate. I love it, although I'd prefer it to be a bit brighter... it's like an awesome wife that annoys you because there are a few traits that could have really been better. Almost perfect, almost, but... not there.
Don't think this is a model that will be forgotten easily tho. I've said it somewhere else and I suppose we'll all find out in a decade from now. Not the next R10, sadly, but definitely good stuff.
And here's a photo; Because I like photos.
PS. Love the air and soundstage on these things. For closed cans, it's really something that makes me grab them often if the tracks are already recorded to match them. Again, random suggestion,
Jordi Savall's "La Folia".