dpreview claims Canon G10 has good results at lower ISO settings, very low lens distortion, fast and responsive overall performance, and has excellent movie quality. But price-wise it may seem a little steep for an upgrade. Check out the entire review first before you decide.
[dpreview via ApertureDaily]
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Two important upgrade features are the resolution (12.1 to 14.7 Megapixels) and the image processor (DIGIC III to DIGIC 4). Unfortunately, G10 has lower optical zoom than G9 (5x vs 6x).