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Randall's are still made in 440C. It is the 440A that you have to be more concerned about as that is often used by the Chinese manufactured knives, especially the ones that say "stainless steel".
I'm no steel expert, but I don't know if I'd go so far as to say that changing a steel necessarily "improves" it. For example- if the "recipe" of a steel were changed to increase edge-retention, that change might also increase the brittleness of the steel, or result in some other negative issue. That would make the steel different, with different properties and characteristics, but not necessarily "improved". But like I said, I'm no steel expert and certainly don't pretend to be.While the 440c us a good life , let's look at the history. It started out with 440c which was modified [improved ] to 154CM. That was improved to CPM 154. If you use the three you will find that CPM154 is the best.