This is a real testament to the capabilities of lower vanadium steels when they are much more scientifically designed. M390 is fairly new tech right? And S90V has been around since the late 90s as 420V right? Okay, I know S99V isn't exactly old school, but these newer Bohler steels are almost futuristic in their performance considering how well they sharpen and resist corrosion, not to mention the reasonable toughness of M390.
I am blown away by how close it was, and for me, M390 sharpens up easier and takes a keener edge too.
Good test, I have an HTM Gunhammer in S90V coming this year, should be a monster at 60-61 Hrc.
Thanks for another excellent test Jim.