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The 5DIII should do just as well or better than your 7D for focus tracking in AI servo, all other things being equal. It certainly should not be substantially worse. Your first image appears out of focus too, just not as bad. The eye does not appear as sharp as the tongue and some of the hairs near the collar. Were you focusing on the eye? I assume you were in AI servo.
One comment you made stands out. With AI servo you are using one point. That would mean if your one point goes off your intended target for too long, it will change focus. I know you are doing one shot right after the other. Alternately, the one focus point may not have enough contrast to make an accurate focus adjustment repeatedly. Lastly, you are not using focus priority for initial and subsequent shots. I would think for a dog moving about you should be fine with the default focus tracking settings. Just my theories. Having used the 5DIII in AI servo for over a year, but by no means a skilled expert like those on the nature forum, here are my thoughts with your focus issues.
For subjects that don't move around too much or if I am using a gimbal head, I will use center point focus with all the surrounding points assisting while in AI servo. This gives me some wiggle room for tracking, literally, as I track with a total of 9 points after acquiring focus. As mentioned, it is great to use the joy stick to move that box around for composition. For birds in flight hand held, I often use ALL focus points in AI servo. When you choose all focus points in AI servo, the initial focus point will be the center point (unless you defined it elsewhere), then it will track with all available points based on your lens. This helps my unsteady hands and potentially allows for better compositions.
You should be fine with high speed rapid fire. I recommend you try a few things.
1. Try expanding your focus points to the 8 surrounding assist points. Try with all too.
2. Change both shot priorities to focus.
3. For out of focus images (esp in AI servo), one very very very important tool is to open your canon raw file with the canon editing software (DPP). In the top toolbar you can select to view the focus point(s) that were active, if any, at the time the image was captured. This can be VERY instructive when you zoom in a little. For example, if a focus point was active on the eyeball, then you should next examine your shutter speed or micro focus adjustment settings.
4. post images with exif - your focus tracking may not always be the IQ issue.
5. Only write to a fast CF card in the 5DIII or your write times will suffer from slow writes to SD slot. It does not matter if your SD card is fast since the slot does not support UHS. Casual shooting it is not an issue, but for repeated long bursts of active subjects you will miss shot opportunities while it writes to the SD card.
Have a fun trip.
David
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