There sure is some magic in the Z1Rs. While the bass is most definitely a feature, the pure detail they pick up is amazing.
I'm comparing them to the Hifiman HE1000 v2 (despite my ears still feeling a bit odd). On some tracks the Z1Rs bring out details that I can't even hear on the HEKs. For example at the very start of George Ezra's Blame it on Me someone whispers something. On the Z1Rs I can hear the whisper as being pretty loud, although I can't quite make out what's said. On the HEKs I can't hear it at all unless I turn the volume much higher, and even then it's almost imperceptible.
I'm not for one second bashing the HEKs. They sound amazing, I enjoy them far more than I do the HD800S. They're also straight out of the box, and reportedly need 200 hours of burn-in to perform at their best. However what seems apparent to me is that the Z1Rs can hold their own at the highest level.
Another interesting thing is that someone recently said that to them they sounded flat with no emotion. To me, out of the headphones I've tried in the last three months they transmit by far the most emotion of all of them. That includes the HD600, HD650, Fidelio X2, HD800S and the HEKv2. Of course everybody has different hearing and taste, but I also wonder if there is some sample variation. Sony's cameras and lenses have some pretty bad sample variation at times, and seeing the earlier posts about different pad thicknesses rang alarm bells.
Edit, corrected the song