I’ve only used a 40D and 7D and even though their auto focus system may be more advanced than the xxxD series, I still have my fair share of out of focus and soft images.
If you have all AF points active, the camera will usually focus on the object nearest the camera with the greatest amount of contrast. If your target lies further away, then it will likely be OOF.
Even on a tripod, slow shutter speeds can produce soft images when you pixel peep, unless you use Live View/Mirror Lock Up and a remote shutter release.
I think that you can check which AF point was used when the photo was taken so go back over some of your less sharp images and establish if that is a candidate for the subject being OOF.
Cheers
Dennis
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