Here is another comparison. Gillette Platinum made by PPI (Russia) and Gillette Shanghai (China). On the left Russian (manufactured 11/20). On the right the Chinese (09/23). Do not pay attention to the Russian pack being a different hue. There are also Russian batches that have the darker colour like on the Chinese ones.
Usual methodology of comparison. Only brand new blades are used for one shave. Nothing changes, except the blade. Same razor, cream, brush and aftershave. The first razor used was inconclusive, so a second pair of brand new blades were used in another razor.
1) Parker 97R.
I must say the difference is small but it's there. Closeness of shave was almost the same. The Russian blade tone is higher, the Chinese is louder and lower. This usually means less sharpness. One important thing to mention. During aftershave application there was much more irritation with the Chinese blade.
2) Merkur Progress @3
Here things were different. The Chinese blade had some very light resistance on a couple of spots. Again the same difference in sound. Higher tone with the Russian blade, lower with the Chinese. Although irritation during AS application was equal, I have to say closeness of shave with the Chinese blade was less. At least 40% of my face had the stubble felt only after some 3 hours.
The bottom line:
Here the differences are even smaller than with Astra SP. I must emphasise some users probably will not be able to feel them at all. For those who thought the Russian blades were too sharp for them the new Chinese ones might be a solution. On the other hand those who need something very sharp might not be fully satisfied with the Chinese blades. Both are excellent though.