Depending on if you buy new, who built the car, what time of year it's built - all these things come into play.
My car was built by JPS in the fall/winter of '03. The build time was relatively fast, about four weeks. After about five months a crease developed where the firewall meets the rear deck. A few ripples developed on the driver's door and there are numerous areas that have shown some minor ripples over the years. Certain colors (like white, yellow, beige, gray)hide imperfections. My color (liquid copper metallic) does not. Rich, bright, metallic colors and, of course, black seem to accentuate any and all imperfections. My body was air-cured for a short amount of time before it was painted. Some manufacturers, like Intermeccanica, oven-cures their bodies.
My suggestion? Buy a used, older car that has had the paint redone or refinish it after purchase. Or consider ordering the car during the warmer part of the year and request to have the body cure for a couple months prior to paint.
For me? I'm waiting until the body stops "moving" then blocking and repainting.
Same color, of course...;)