Never had the stainless but had the carbon and SG2. The carbon and sg2 are actually very different. The carbon has a 4 mm spine while the sg2’s spine was a little thinner than 3 mm if I recall correctly. The carbon has a full flat grind from spine to edge with 0.25 mm thinness behind the edge, while the SG2 one has a half flat grind from the middle way of the geometry and it is 0.35-0.4 mm thick behind the edge. I think the carbon cuts better than the SG2 by quite a bit. The stainless one could be a different story though.These two knives are about as close are you're going to get to the same knife in different steels - Euroline Stainless (13c26) and the 1.0 version of the Carbon (52100).
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The 2.0 Carbon is a slightly different profile.
I didn't have the two knives at the same time, but had the Carbon, then the Stainless, and now the Carbon again. The stainless was a functional knife, but missed something compared to the carbon.