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First of all if you want to make sure your lens isn't faulty and giving you blurred shots you should take several shots on a tripod of the same object but at different settings .
Secondly any image shot in RAW will need some sharpening in camera raw other wise they will look a bit soft .
I'm not quite sure what you mean about the f stop on the lens being different outside ?
Having said all that the images don't look like they have a focusing problem .
Mark
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