I've never used the 85. I do own the 135 and use it most of the time for indoor high school sports, basketball, volleyball, wrestling. Of these 3 sports I find that volleyball is the most challenging to shoot because everything is moving so fast. I get very good results with the 135 on my 5d III. It focuses fast, handles the poor lighting found in most gyms, and is sharp. I generally walk out of the gym with many "keepers" from the action.