It produces a native 4:2:2 picture, so I imagine the CCD has a bayer pattern as that is 1920x1080 green and 1920x540 red and blue pixels.
There is no question that the live action elements look inferior compared to TPM’s. On the subject of TPM there are actually a few digital shots in it, this is one of them:
The give away in this shot is the haloing on the contrasty parts of the picture. It’s much harder to tell on the DVD/HDTV version as the haloing is all throughout the film as it is, but you can see in that screenshot haloing on the umbrellas and other parts and that’s from the digital protoype camera Lucas tested on some of the shots he filmed in post-production (or after the principle photography anyway). This shot also looks to be digital as it has haloing on the Bluray:
Here’s another, very easy to spot on the bluray:
Note how the dark reds are really low quality, that’s indicative of the bayer pattern and when you see it in motion it looks really horrible. I’m surprised they didn’t digitally inpaint that for the bluray. There are other parts of this celebration shot digitally as well including possibly the last shot of the movie. Which makes sense as it looks like they used the same steps they used in those Tatooine crowd shots:
