Here’s Digital Camera Info’s conclusion on their comparison of the Canon SX1 IS and Sony Cyber-shot HX1:
The choice between the Sony DSC-HX1 and the Canon SX1 is a tough one; both scored well in our tests and provide an excellent selection of features. The Canon had the edge in a few of our tests (color and noise in still images), but the Sony came out tops in others (such as resolution, image stabilization and most of our video tests). In the end, the choice will probably come down to the appeal of some of the extra features that are on offer (such as the Sony’s excellent panorama and low light shooting features) or price: the Sony is $100 cheaper than the Canon SX1.