The Sony MDR-R10/CD3000, Qualia 010/SAx0000, & Z1R models are from completely distinct eras of Sony. They each represent such different (& pretty much opposite) approaches to a certain ideal that they might as well have come from different companies.
Purk, if you'd like to hear an interesting headphone that is very reminiscent of the venerable R10, check out the Final Audio Design Sonorous VIII & X models. I heard them at CanJam NYC this year, & was left with more of an impression than from the Z1R.