Depending on which copy of the lens, it's not likely MF. Also, it's a great, fast lens, but it is a fixed focal length, so you need to know that's okay, before getting it. It's plenty fast to shoot sports photography, but that's a pretty large category. So, you should be more specific. Shooting high school wrestling in a gym isn't the same as shooting hockey in an ice rink, or cars or motorcycles traveling 200 mph. Distance to subject has to be considered, too. If you're close, then the 70-200mm f/2.8 may be a better option, since it provides some FL options. If you're at a greater distance, 300mm may not provide enough reach and a TC can increase your reach, but also cut your aperture by 1-2 stops, depending on the TC you opt to use.