There are many reasons why we need to sharpen images which has nothing to do with not operating the camera correctly. This includes, moving subjects, camera shake, auto focus errors etc.
Currently, I believe the best S/W for sharpening is Topaz Sharpen AI. Apart from my own experience, one of the forums of which I am a member has many comparisons and comments and Topaz always wins. I have read a review of a straight comparison between Focus Magic and Topaz and the reviewer though no contest with Topaz a clear winner. Of course Topaz Plug-ins are not cheap but you can usually find special deals from time to time and can also get a discount code from Clive Haynes website. I have most of the Topaz Plug-Ins but Sharpen AI, De Noise AI and Mask AI are probably the most useful.