Serious Compacts has posted Canon S90 and Ricoh GR Digital III Lens Performance Test.
Serious Compacts: Many people who are interested in a Ricoh GR Digital III are also interested in the Canon Powershot S90 IS. Like the Ricoh, the Canon is small (smaller than the Ricoh, in fact), light, has excellent manual controls, a proven heritage, a high end small-sensor, and a fast, wide lens. (... Read more)