The one thing I enjoy a lot is using my 55 1.2 Ais and using manual focus. There are some misses, but when you hit it, it's sharp, much sharper than any zoom I know of.
I messed up my export settings for my zoo pictures, forgot to include exif... So most were taken with D7200 and 200-500, some others with Df and 28-300.
This one with Df. I did bring my lens shade which might explain for the flare. I was tempted to remove it but after working on it for a while preferred to leave it as it gives the image a special mood.