IME, a top tier China made razor HD is on par with the discontinued Japan made versions. However, the variance sample to sample on the Chinese razors is extremely wide. So the need to sample test when purchasing is higher.
I’ll echo what was said above though, the Maven C series is on par, and in many ways superior, optically with the Razor HD’s for a fraction of the cost.
The current production Japan made Razor UHD’s are fantastic. I stand by the fact that if Swaro had released them, made in Japan and QC by Swaro, as the “SLC2.0” or something, people would refer to them as alpha. They’re top shelf optically. But they do have some shortcomings in the aesthetic build quality department, lots of them have reports of the decals peeling off and falling off, and the rubber skin on the focus knob on the ones I had (UHD 10x50’s) wanted to peel off the inner knob portion. For the price, I personally would expect better aesthetic build quality, especially since they’ve increased the price on the full size UHD’s about $300 since release.
I’ve since replaced them with Maven B6 10x50’s and don’t regret the decision.