Certain comments here are somewhat misguided. Comparing leading edges gap quality or whatever on B737 and Airbus aircraft as an indication of build quality and indirectly safety, is misguided at best, and totally off the beam at worst.
Quality is not about beautiful smooth curves and so on, its about fitness for purpose. To put it another way, if the ragged edge makes no difference to performance and safety, then leave them exactly as they are - don't guild the lily, it adds to cost.
If the Boeing designers designed an aircraft in such a way that it can be constructed by semi skilled workers, then no one has a right whatsoever to draw meaningless comparisons with Airbus on the basis of the quality of its labor force.