Although T.I. is correct, it would have been better if both camera and subject were on the same plane, I'm not convinced that's the problem.

Do you know if your camera is sharpening the images? There should be a setting in the menu that tells you if any sharpening is going on.

If no sharpening is going on, that may be it. In my experience (though I only shoot RAW) digital images need to be sharpened.

any other opinions? Thx! Marko