Thanks for sharing. I don't know much about Komura lenses, but I do have a Komura six-element enlarging lens. It compares very well to my Schneider and Nikkor lenses of the same focal length.
I have a Komura 300mm 5.6 that I use on 8x10. It's a nice lens. Small, sharp, great rendering. Definitely not huge in the way of coverage. I'm actually thinking it will be quite nice on 5x7.
It's impressing that the 210 will also cover 8x10!