This is where a small flash, bounced from the ceiling, would have allowed at least another a 1/4 to a 1/3 stop of light. That would have prevented the 1/50th sec. (even with IS), and would have achieved 1/80th, where you'd be seeing much sharper, less noisy pics.
However, seen you said those are the 'untouched' jpegs...open DPP (the canon software), and open the 'Raw' file. Within there, open the tool palette, and go to the RGB tab...sharpen a little bit in there, and tweak some other settings, including white balance. You'll notice a 'huge' difference...or at least I believe you should... 








