Quote Originally Posted by threeputt
If you dropped it it would likely shatter. Boker has made a few ceramic knives over the years and they do indeed hold an edge for a long long time. They DO get dull though, and the only option is sending them back to Boker for sharpening. I didn't know Kyocera had already looked into this. Makes sense though. I'm thinking they didn't do a str8 though to test. And if they did, they probably couldn't find anyone with the experience to give it a good go. If they wanted they could slightly round the edge, microscopically speaking. The Boker pocket knives with ceramic blades were decently sharp out of the box, but nothing like a razor. I believe they could make a str8 such as that precisely as sharp as they wanted to.
I have seen that quote about ceramic blades before, and I don't believe it. The main reason is what you said: they can always shape the edge. The other reason is that razors tend to be sharper than any other edge. They're always trying for a razor sharp edge. So, it's unlikely that some other application would be too sharp.

I have also seen an honest statement by another experimenter that they couldn't make ceramic blades sharp enough to be useful as a razor.

We had a long thread about ceramic blades on another site.