I have a question about two lenses for my Nikon D7100. the 85mmG f 1.8 and the 50mm f 1.4, both are nearly the same in price, but not sure which way to go. I wanted to use either for a job doing a family portrait. The 50 would be like a 72 mm and the 85 like a 127 on the 7100. I would like to get what I pay for though, rather than spend over a thousand. thanks. I also have the 16-85 Nikkor zoom. I would think a prime lens may be sharper ???