These knives are kind of interesting, I just played with the thicker one this evening for a few minutes which is an odd design for a knife, if this is intended for wood working then the user better be Žydrūnas Savickas as the blade is extremely thick with a very narrow edge bevel and it looks more like a splitting wedge than a knife.
The edge would appear to be sharp, it will catch on the thumbnail easily and it feels aggressive if you drag your finger across it on a perpendicular but it has no slicing ability at all. To be clear, I took the knife and pressed it the full width of the edge bevel into the edge of a roll of toilet paper.
I then maintained a downwards force of 10 lbs and sliced the corner of the toilet paper the full length of the blade, this cut fives pieces of the toilet paper and just dented the rest. In contrast taking a random Mora and using a downwards force of less than 1 lbs (it won't even register on a scale), it easily cuts the full width of the bevel into the paper.
So I take the edge and cut it right into a 1000 waterstone to grind off the edge to remove the possibility that the metal on the edge is weakened. It is not easy, it takes five cuts into the stone before the edge stops biting on my finger nail which is a bit odd, it would only take one on the Mora.
I then regrind it on a 200 grit SiC water stone, the bevels meet clearly, feels aggressive, thumbnail says a-ok, and you can press this into a tomato so hard it squashes it flat and it has no slicing aggression at all and this is off of a 200 grit x-coarse stone.
I figure that the edge is micro-fracturing so I take a 600 grit DMT rod and extremely lightly apply a micro bevel, and I mean feather light, not close to the weight of the knife. After five passes per side the edge starts to respond and parts of it start to shave and repeating the toilet roll cutting sections of the edge bit in deeply as normal.
If anyone is curious as to why this works, diamond is harder than any steel or even carbide in steel by a large amount. It is so much harder that compared to diamond the metal in the knife is basically butter. Because of this you can sharpen with diamond at extremely low forces this allows you to sharpen edges which will fracture with any other abrasive which need more force to hone.
So, initial impression is that the edge is not properly heat treated and most likely has untempered martensite, or heavy grain growth and significant embrittlement or both. In any case it would be extremely frustrating for someone to try to sharpen, it does not form a burr, it passes most feel tests for sharpness, but if you try to slice something it behaves like a prop knife.
kurodrago, I would like to put a primary grind on these if you don't mind as right now to sharpen them takes a massive amount of time due to the very wide edge bevels so each time I have to sharpen I have to plane down a piece of steel which is 3/8" wide.
I would like to reduce the edges down to about 0.005" thick. After sharpening, edge retention cutting etc. the edge will thicken back to 0.010-0.015" or so and be stable for heavy wood cutting.