Someone said, "you are what you eat" Very true specially on reptiles. In my experience, one of the first things that go away on Falys once in captivity (I dont want to hijack the thread) are the intense yellow cheeks and eyes, either they fade or they totally go; same with their offsprings, the intensity is lower or none.
With chameleons even surrounding lighting can affect the colour they display. I have sold chameleons ok looking to me and when they are on a different display with different lighting they look amazing! and viceversa.
Looking at the sire really doesn't tell you much how your cham will look like. If you care much about looks, then wait and buy them full grown so they display their true colours.
Another example, dart frogs, guess why they are deadly on the wild and not in captivity?