Here’s why GeraldW switched from the Panasonic FZ28 to the Canon S5 IS:
Here’s a couple of things to consider with the ZS3.
First, the color is not as good, particularly in skies where Panasonic cameras often show that as a sort of aqua color.
Second, the ZS3 has no internal adjustments for sharpening, contrast, or saturation – only a very few Panasonic models do have internal settings anymore. Canon models still retain this capability.
Third, the Canon IS (Image Stabilization) seems to be consistently better than Panasonic’s OIS (Optical Image Stabilizer) – that was certainly the case with the FZ28 Vs the S5IS.
Personally, I much prefer the Canon menus and controls.