In terms of quality of picture and overall detail of subject (e.g. the face of a child), would it be better to stand closer to shoot at 50mm or stand back at 85mm (assuming the quality of the lens was equal, and disregarding the difference in depth of field, and difference in perspective).
I have a Canon 24-105mm L and when I shoot at 85mm and stand back for a full body shot of my little girl, the overall detail in the face is poorer than if I stand closer at 50mm to get he same shot. (ignoring the change in perspective of course).
Is this just my imagination?