I think most of the time a 50mm is a better fit focally. Often a 85mm is larger, and heavy or can be. But there are some amazing 50mm and 85mm lenses in the world.. Now, The better question is how the lenses compare..
Ernst Leitz Wetzlar Summitar 5cm F2. Fuji X-E2. These were taken last night at Munsinger Gardens. http://www.munsingerclemens.com/the-gardens/munsinger-gardens