I respect Jim and his testing procedure but my experiences with BD-1 in day to day, edc use ( not scientific or rope cutting like jim) leaves me with a feeling like a steel somewhat above 12C27, 13C, 420HC, Aus 8, etc.and a few more. It is a bit more difficult sharpening ( relative, to me S90V isn't a problem) than the razor steels but it's not bad at all. I like it, as I liked Gin 1 . We are talking about a steel with almost 1% carbon and 15.5% chrome. It seems pretty balanced and not great, or weak at any one attribute.
Joe