MidFiMoney
I was hesitant to weigh in on the three headphones you've asked about, but since I haven't seen my perspective posted maybe you'll find this useful...
I'll start by saying that for my listening preference, I'm seeking a neutral response from my entire signal chain. So if you prefer a brighter presentation, adjust my perspective accordingly.
I own the Utopia, HD800, and I have spent time listening to both the HD800S and the Z1R. Of these choices, it is no contest that the Utopia is the best headphone in articulation, separation, and balance across the spectrum.
After the Utopia, it's a choice between the HD800 and the HD800S. This choice for me comes with a caveat: I find the both of them lacking in bass response and overly emphasizing the upper mids and treble, the 800 more than the 800S. The 800S only starts to address the issues of the 800. To be able to listen to the HD800 for all kinds of genres, especially those that have a lot treble and bass like electronica, I use Sonarworks which does an unbelievable job of flattening the HD800's frequency response. Because of how well Sonarworks corrects the HD800, there is no need to spend more money on the HD800S, particularly since the HD800S still has similar flaws as the HD800, even though it is to a lesser degree, and Sonarworks does not have a project file for the HD800S. In short, save some money and get the HD800 and use Sonarworks.
As for the Z1R, I demoed it with a portable DAC/amp. To be fair though the DAC/amp was Sony's own PHA-3 and it was used with Sony's own balanced cables into the PHA-3, which provided plenty of power to drive the Z1R. I found that detail retrieval was lacking when there are a lot musical elements present. It couldn't articulate everything that was going on. Female vocals were riddled with sibilance. And I found bass response was abruptly stopping instead of plunging deep into the lower frequencies. One particular electronica song I was testing with was just unlistenable. I will say that the Z1R may perform better with a better DAC and amp, but I can't understand why it would be so bad with Sony's own former flagship portable DAC/amp.
My advice is if you're going to buy only one headphone for the next couple years, then go with the Utopia. If you want to save some money, then get the HD800 and Sonarworks. Find an
unmodified (you don't want the frequency response modified if you're going to use Sonarworks) used HD800 and Sonarworks and you're good to go for under $1000.