Okay, so I was wondering which lens would be better for low-light sports photography, or which is just a better lens in general? I know that neither of these are the lenses of choice when it comes to sports, but I don't have the money for a 70-200 f/2.8 lens. I've read some of the reviews on both of these and I was wondering about image quality at the widest aperture. The 50mm has a wider aperture but is the IQ at 1.4 going to as good as the IQ of the 85mm at 1.8? Is there even that much of a difference between 1.4 and 1.8? As in; will 1.4 even be useful or needed? Or will the tradeoff between IQ and shutter speed be too great? As a side-note: I recently purchased a used 1D Mark II. I'm not sure if that affects which lens is better though.