Canon Bebit seem to have updated their S20 samples page with a set of six new samples, which appear to be slightly sharper and more neutrally coloured than the previous samples published (and those I've shot myself) -Thanks to Steve Luciani for this note.

That said, the image of the tree does appear to show some chromatic abberations and vertical "algorithm lines".

Click here for the updated Bebit Canon Powershot S20 samples page