Maybe its just that I look around and I am more willing to label a poor performer a .25x coder, than I am someone who can really crank it out a 10x.

I think the x-factor we are talking about is too abstract to really have meaning. For example, besides speed, my x-factor takes into account things like test coverage, maintainability, code performance, etc. When you make it very multi-dimensional it tends to even people out as folks often have very different strengths and weaknesses.