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@Well_is_it
I wouldn't go as far as calling it a problem in that the 24-105 is known to be a bit soft. It's basically a glorified kit lens. It's pretty good but just not that sharp when you look at the photos at 100%. Comparing it with a 50mm prime will show this even more as primes tend to be really bloody sharp.
As for the slow focusing, it's probably partly down to the F4 aperture making the AF system work that bit harder; wider aperture lenses tend to focus quicker.
Basically, unless the images are noticeably soft when viewed at normal sizes, don't sweat it.