I've heard it compared to CPM-M4.
Out of all of the upcoming models/Sprints, I'm most excited for the HAP40 Endura and Delica! Hopefully there will be a Dragonfly and Ladybug too like with the Super Blue run.
I've never heard of HAP 40, but it is indeed similar to CPM M4 in composition, with one big difference -- 8% Cobalt, which along with the high Tungsten level also found in M4, should give it some interesting properties... here's a comparison: