Don't go overboard analyzing JPEGs posted online.
Start with RAW, and do similar processing so that you know what you get.
One might have sharpening set at "5", one at "0". Those are just samples that conform to some unknown desire of the shooter to portray what they wanted to portray. A mood, etc.
I am NOT saying Canon will be better, or worse, or anything. We jsut need a lot more info.