I own a 16-35mm film lens from Canon for my 5D Canon camera. It is my favorite lens. It is the closest thing I could get to a fish eye lens.
It takes wonderfully sharp wide angle lens. You can take gorgeous pictures of landscapes or take slightly distorted
portraits up close of people.
I took some pictures of a friend up close from the floor and it made her legs look super long at she looked very tall in the final picture. I suggest getting a UV lens to go over your 16-35mm so it doesn’t get scratched. The lens I bought is a film lens not a digital one. The film lenses from Canon tend to be sharper and of better quality than digital lenses. Not to mention if you buy the film lenses you can use them on both digital and film camera bodies. Whereas ...