Edges on rat knives

They're all straight edged 20 degree edges. Well, excluding the serrated models anyways. Edge retention should be similar, though I don't know for certain if there are any subtle heat treating differences between models. RC-6 may be a bit softer than the izula for instance. I'd doubt you'd be able to tell even if there was.
 
They are all flat ground at 20º per side or 40º inclusive. All of their models with 1095 should have the same edge retention and I believe all have the same rc(rockwell) hardness.
 
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