Marko Tsourkan
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Not to contradict anything tk59 said, but just to add that both have different geometries, Heiji - convex with blade road on both sides, Shigefusa - hollow-grind with convex at the edge (abut 3/8 or so). Thickness-wise, later Shigs are thinner than earlier, not sure if thickness of Heijis changed over time. The one I have seen (Heiji suji) was pretty thick and would almost certainly wedge in dense stuff like potatoes. I haven't seen a Heiji gyuto upclose, so can't comment on thickness.
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