Woodturners seem to focus on two things when it comes to their tools (besides brand) -- the sharpening method and the steel alloy. What they really are looking for is how long will a sharp edge last and how is that related to how sharp an edge can be achieved with any given sharpening method. Neither of those question has a quantifiable answer, so there is the perpetual search for a substitute answer that that will satisfactorily scratch that itch. If I understand the question that John is hoping to answer, I believe that information is already readily available for any tool/HSS alloy, but unfortunately not as a neatly packaged for woodturning consumption type of answer. The data that describes the characteristics of these various alloys would only serve to give the average woodturner a case of acid reflux after trying to digest the data. Just to increase the level of heartburn, for any given alloy, the method of tempering has almost as much impact on the answer as does the minor variation between different alloys in woodturning tools. The good news is that nobody longs for the "good old days" when carbon steel was the sum total of our choices. Being overwhelmed with options is actually a great thing when you think about it. So, toolmakers, "keep on whelming us". Somehow, we'll get over it.