The Addict 2 I have here in CPM 154 already; it's a very thin, tall blade, lightweight. It's got a long flat spot towards the heel. 52100 is a very fine grained carbon steel and I would imagine it will take the wickedly sharp carbon edge I prefer, but the CPM 154 may take a slightly steeper angle and hold the edge a bit longer, but will be harder to sharpen. CPM 154 is a very fine grained steel, almost like carbon.
The Tanaka Sekiso is a great blade. It has a D shaped handle on it, buffalo horn ferrule and Ho or magnolia wood for the rear part. The blade is a bit thicker at the spine than the Addict 2 and there is less of a flat spot; it has more of a gently curve to the blade. The blade is crazy thin behind the edge with an excellent convex grind. It is a layered damascus blade and the layers are able to be felt, so food doesn't stick much to the blade compared to the Addict 2. I put my Addict 2 and the Tanaka Sekiso head to head on sweet potatoes; the Tanaka won hands down. The Addict 2 did well, but the convexing of the Tanaka helped a lot. Regular potatoes, onions, mushrooms, peppers, steaks and other foods, they both perform well. The Tanaka is more of a work horse and the Addict 2 is almost Laser type. I have used my Tanaka since August and have only stropped it a few times; it still sticks into my cutting board for a week or so after stropping, but I haven't been cooking as much as usual lately. I have a Blue #2 Kurouchi nakiri from Tanaka that I have sharpened and it takes a wickedly sharp edge!
I don't have a Goko, but I have a Fujiwara Terayasu Nakiri in white #1 clad in Stainless. White #1 will take a bit finer edge than Blue or 52100, but it's splitting hairs at that point; they all sharpen up to a stupidly sharp edge easily and touch up easy on a strop or fine stone. White steels are generally more reactive than Blue steels, but the Blue steels are still fairly reactive; they aren't semi stainless or anything. Haven't played with a 52100 blade much, but it will also react, maybe less than the White and Blue steels, judging from a small paring knife I have in 52100. The Goko is clad in SS, the Addict is straight 52100 and the Tanaka has a blue #2 core and layered carbon damascus over it. Just looking at the pic of the Goko, it looks like it is almost flat until the tip; reminds me more of the Addict 2 shape.
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