The back edge (usually shorter on kirach; this one is unusual at least to my experience, and it sounds like to that of others as well) looks sharper perhaps because its bevel is wider; I'm pretty sure this is due to the blade having somewhat of an overall wedge-section, rather than being flat (?) thus for the same angle (is it?) to come to an edge takes a wider descent thru the thicker metal at the spine side of the wedge?
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