I chose this thread to ask this question because in several of the others I expect the answer would have been much much different but maybe not... Okay you go out on a job lets say a wedding because it is more demanding than a family portrait. You have a bag full of glass, you can choose anything you want. Now give this some thought.... Do you use a half dozen prime lenses for the higher quality or do you make the trade off for a zoom lens that is more convenient. It is actually a fair question one most photographers face most of the time. This is assuming you own all the glass but only a couple of bodies.