I was wanting to ask this question to anyone who owns more than one type of rat knife, I work in a lumber mill and did my own bluntruth test with my izula on some kiln dried wood, I cut a 1x4 into and still retained a razor sharp edge! my question is this, do all makes of rat knives have the same edge retention? I understand diffrent knives may have diffrent steel, I was just wondering if they all pretty much hold an edge as good as the izula?