Ok, sure, its not some assembly line Chinese product but given the vast resources Sony has at their disposal, the Z1R should cost far less than it does. Its more of a pride thing than anything else. They think their headphone is worth $2400. I happen to disagree based of measurements and subjective impressions.
I think the thing that irks me more is that companies like Fostex and Sony don't seem to get any feedback on their designs before they jump into full scale production. Does anyone else find it kind of amusing that Massdrop turns out better versions of headphones than the companies that built them originally? Why is that? Because of feedback. Massdrop isn't afraid to let moders go to town to improve sound quality and then incorporate some of these tweaks into production. The Fostex THX00, TX0, K7XX etc are all this way. I doubt anyone outside of Sony ever heard the Z1R before they settled on the production tooling. Of course you are going to think it sounds good, you designed it.
If the QC process is so rigorous, why are some copies measuring differently than others? Audeze and Focal have had the same problem. For the price they are asking, I would expect each copy to be measured on their rig of choice to confirm it is meeting the response curve of the final prototype before it even leaves the factory.