I pretty much agree with DaveW,
I do not have a Western Style Japanese razor as they have been totally out of sight as far as price.

I have bought quite a few Japanese frame backs and Kamisori. The quality of the edges all was very good to OMG. That said,
Yasuki Steel is a black sand steel made by a large steel company by a traditional method. It is available in four grades and the razors made from it seem to be Rc 60+.
Tamahagane is a ancient black sand steel and is abut as expensive as any steel out there. As the post above says, look for a known smith to buy the best.
Now its down to 86 bucks for 96 grams. about 3 ounces. And that is pretty much unrefined raw material.
Swedish Steel is often remarked on the blades and they do a nice job with it.
The frame backs are really excellent but may eat a soft hone and can corrode quickly.

I enjoy them and as the prices have dropped significantly a purchase of the best is only a click away.

Just my opinions over a couple years. For example, I have one razor new purchased! The others are all used.
~Richard