Most of them just look like poor focus. Work on your focusing technique with easier shots like slow speed corners and make sure you pay attention to your focusing technique. If you find your results are much better then you've found the problem, you need to be more deliberate with your focusing. Too many folks think these cameras are magic and if you simply point them in the general direction and pull the trigger, focus will lock on to what you are after.
If your results don't improve there then start testing your equipment on static subjects to rule out any front or back focusing issues with your equipment.
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