Canon made a lot of improvements on the Powershot G9 - most notably the image quality, LCD screen, and RAW file capability.
The Canon G9 offers more megapixels than its predecessor, the G7, which on paper suggests it will have better resolution but more noise and worse dynamic range. Our tests prove the G9 has significantly better resolution, better than most cameras released this year. Noise levels are high, but not any higher than the G7, which is commendable.
Color accuracy is fantastic, as is the Movie mode, both of which have become consistent successes for high-end Canon PowerShots.