Interesting. I'm specifically meaning knocking the shoulders down on the INFImandu I bought from you. It was a far greater pain to do than knocking the shoulders down on the SR-101 Ratmandu that I already had.
To me, the steel feels very different on a stone. The only way I can describe it is the INFI feels almost lubricated, wet, almost, compared to SR-101. I have read it has some cobalt in it, but I thought it wasn't that much. But it has the same feel of several other knives that I have that have differing amounts of cobalt in them. Dunno.
It is also, IMO, more difficult to properly remove the burr at the apex. I attribute that more to my inexperience at sharpening it than a fault of the steel. I will say that once I knocked the shoulders back on that INFImandu, its abilities in my limited experience have been pretty impressive. But, to be honest, so have the abilities of my Ratmandu in SR-101.
Thus my indecision. I think, other than corrosion resistance, the differences between practically identical blades, like the 'mandus, are going to be so subtle that it is going to take a lot of work with both to tease the performance differences out. And the results could be entirely different for a different knife size. And perhaps even geometry.
I wish I had nabbed a SHe now, since I did order a BGFSH. I would have liked to compare the two of those.