I'm looking for experience with shooting sports/action using a 5D Mk III, especially compared to the 7D.
I've had a 50D for almost 4 years now and I've been generally underwhelmed by the AF system, so I'm considering my options.
Right now I see four options: 7D (possibly used), 5D3, 1DX, or wait for a "7D2". I'm an amateur, the cost/value ratio of an 1DX would rather low regardless that I could find the money to buy it. 5D3 is kinda borderline. As for 7D, I'm hesitant since it is 3 years old and the sensor seems just as noisy as my 50D. I believe that a 7D2 will not show up until next year (at least).
I want a body at least at the level of the 50D (AFMA, size/metal body, UI), so the 60D or lower is not an option. Nor is defection to Nikon an option.
Knowing discussion boards, I anticipate that some will jump down my throat saying that I don't know how to use the camera. Thank you, I do believe I know how to operate the camera
So for information, I generally shoot in Manual, with either Spot AF or AI Servo, with only the center point selected. My lenses (17-40, 24-70, 70-200/2.8 IS I) are micro-adjusted to the body. I often have problems if the area that I'm focusing on is relatively small, but still larger than the AF box. Before the warranty expired, I had the camera checked at the Canon service center and they did not find any AF problems.