Certainly there is no direct measure. Hence the joy in watching a fight.
Read my 2nd last post concerning the degree of luck required. I agree its never all luck.
To say however, because I intended, there was no luck involved, is as preposterous as saying Serra winning was entirely lucky.
I can do and have trained to do a pretty good tornado kick. If I fight Anderson Silva and honestly think to myself, I'm going to try a tornado kick and knock him out, and then, I actually do, there's no better word choice to describe what happened but as 'lucky'.