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".
|Common Flashwing by digimania|
from canon dslr
|The Marilyn impersonator by Lee8282|
from Blowing in the Wind (Nature)