These pics are compressed (by me to make uploading and viewing easy--and then again by photobucket, which really destroys a lot of the details.) With that said, the best photos from the Canon S100 are nearly as good as the Sony RX100. The difference? The Sony takes MORE photos that are better than the Canon ever did. The Canon colors were always off and required lots of correcting. I don't think I ever uploaded a picture here without making some changes.
They both might be point-and-shoots, but the Canon is a point-and-shoot-and then go home and spend hours correcting them. I still make corrections here and there with the Sony, but overall it's spot-on and doesn't make those frustrating technical mistakes that the Canon did (mistakes that you only realize when you get home after it's too late).
If I had my choice of a free S100 or a full-retail-price RX, I'd take the RX.