There's as lot of really flattened kamisori on eBay. You need to find something with a reasonable geometry on it. Hard to do unless you know what to look for. Pic below is of Iwasaki cross section
Do you think the majority of these kamisoris have seen years of abuse, or inexperienced honer's.....
As much as Id like to think they lived a good life, I get a sick feeling every time I see a "flat" one....