But to answer your question, I think recent INFI is more like the old m-infi, since it lacks cobalt or nickel and somewhere in time m-infi was stated not to have cobalt in it.
To put it in perspective, original INFI went to 70 degrees and it was 61 Rc.
I bet that at 58-60 Rc modern infi will hit more than the old ones if someone has the strength to do it.
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