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I forgot I started this thread awhile ago. I recently finished a test knife in 15n20, a 270 gyuto with a slight convex grind. It gets plenty sharp and does seem to be a little less reactive than other carbon steels I have used. In some abuse testing I was able to get the edge to roll while cutting raw chicken thigh bones diagonally, I used a steel to literally push the roll back into place and it looks like nothing happened, so it does seem pretty tough.
FYI, Alpha Knife Supply currently has one sheet of "thick" 15N20 listed. it is .116 x 11.5 x 8.5,