The P-47 wing, or What am I looking at?

[JtD]

There's a difference between having a wing with a laminar flow design and having laminar flow over the wing. Surface quality in WW2 for the most part was not good enough to allow laminar flow airfoils to develop laminar flow to a larger extend than conventional airfoils do.

There's also a difference between building one prototype and building 15000 planes.