tk,
I can tell you this single chisel and what it's taught me in having to make up a sharpening schedule for it (the folks who make them don't have one, until I give it to them!) has definitely changed my outlook on sharpening.
I've very much changed my thoughts from "the hardest, toughest sharpening gear is essential!" to more of a older stance, where something that is theoretically not up to snuff can get the job done better, faster and easier.
Case in point;
Sharpening this chisel with a 1-6K diamond plate gave a working edge. It worked, but it wasn't nice and edge degradation was not fast, but nothing spectacular. Certainly not good enough for a $100+ chisel that wasn't banking on it's looks.
Stones made for this stuff, better. A little troublesome, and you know which stones I mean I think.
Switching to a plain old WA 6K, running it wet then dry, got things cleaned up and then polished the heck out of the edge. Only a very small amount of edge, but that was enough. I got the needed refinement out of the edge, and the life of the edge become jaw dropping. A good white steel chisel will hack through 1/2-3/4 of a 2x4 in jarrah before it needs touching up, this thing will hack through it twice, all by itself, and still be danged sharp.
I'm not done yet, but there's more going on than I thought (and I'm thinking about it a lot) and I'm sure that even the 'experts' are willing to admit to. Once you start getting your head around it, it's quite liberating and you can get away with danged near anything.
But after this chisel, nothing is unsharpenable.
Oh yeah, running this one on a King (or similar), the King stays dead, dead flat. The steel is so hard the abrasive can't touch it, so no cutting, no action, no mud, no dishing. Like I said, this stuff is mind bending.
(The plane I've got sitting on the shelf is starting to scare me. Even harder and more abrasion resistant stuff, but less tough.)
Fun, interesting and there's some new stuff coming down the pipeline as well.
Back to work. Folks are waiting on gear, makers are waiting on words.
Stu.