Let me preface with the fact that I dont have any experience with painting notably.

I don't believe it is the quality of the paint so much as the technique of the painter. Numerous thin coats of color and clear with superfine wetsanding in between delivers factory paint quality. Some modern cars have near 15 coats of paint, many of which are clear. I believe taking your time is your key to success with a never ending sanding phase. G/L, I apologize if my info is incorrect or not useful.