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Canon 1D MKIII Results
300mm f/2.8 lens at f/2.8, AI Servo, Center Point Only
latest firmware v1.2.3, sub-mirror fix performed

We ran a number of test trials with this newly refreshed camera. Here are the results across 5 test trials.

Running Test Trial #1:
21 out of 59 Out of Focus (36% Out of focus)

Running Test Trial #2:
17 out of 70 Out of Focus (24% Out of Focus)

Running Test Trial #3:
19 out of 48 Out of Focus (40% Out of Focus)

Running Test Trial #4:
16 out of 55 Out of Focus (29% Out of Focus)

Running Test Trial #5:
12 out of 46 Out of Focus (26% Out of Focus)

Canon 1D MKIII Overall Average:
31% Out of Focus

Click the image above to see all full size files for test run #4
(29% Out of Focus)

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Nikon D3
300mm f/2.8 lens at f/2.8, C-Focus, Center Point Only
latest firmware v1.11
We ran a number of test trials with this new camera. Here are the results across 5 test trials.

Running Test Trial #1:
14 out of 40 Out of Focus (35% Out of focus)

Running Test Trial #2:
19 out of 42 Out of Focus (45% Out of Focus)

Running Test Trial #3:
17 out of 40 Out of Focus (43% Out of Focus)

Running Test Trial #4:
24 out of 36 Out of Focus (67% Out of Focus)

Running Test Trial #5:
21 out of 41 Out of Focus (51% Out of Focus)

And the winner is...

Canon 1D MKIII with only 31% Out of Focus

Conclusion
As we mentioned earlier, there has been a lot of talk about the Autofocus weaknesses of the Canon 1D MKIII. A lot of this talk is quite frankly, undeserved. We have never been able to replicate the seemingly impeccable performance of the Canon 1D MKII as observed by other parties.

I highly doubt many current gear purchasers are willing to go back in time to purchase what is now an ancient camera, in terms of overall design and features.

Hence our test of the current crop of viable options. The Canon is again the clear winner in this category. We also did this same test with one generation earlier firmware and the results were very similar. This earlier report was never published, because we just did not have the time.

Source : ProPhoto Home
http://www.prophotohome.com/forum/pro-photo-reviews-articles/76674-canon-canon-1d-camera-canon-mkiii-camera-vs-nikon-nikon-d3-camera-sports-autofocus-showdown.html

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