The TV is bedding in nicely, there is a recommended run-in setting for this TV for the first 200 hours (don't worry, its easy, just put it into cinema mode). I am on about 130 hours so far, so I haven't tried cranking up the settings.
I haven't tried Episode III yet but I do have it in the drawer (realised which episode III when you mentioned light sabers). Once I am over the 200 hours, I'll try the THX setup and see what I think of the colours. Very occasionally I think "is that red a little orange", but I am quite sensitive to colour.
The thing that really stands out for me is skin tones - very natural, and there does seem to be a good grade of shades between light and dark.
If I had to be hyper critical about the picture, on low grade feeds such as outdoor broadcast of rugby on BBC1, I notice a slight fizzing of the pixels around moving objects on the screen, especially when the camera is showing a large portion of the field of play (i'e a person appears as a small moving object on the screen). Also sometimes when a camera is panning over a detailed image, i notice a slight fizzing of pixels in the wake of the image moving across the screen. It's just noticable if you sit too close (less that 2m) but much less noticable if you sit further away. I have a good quality roof mounted aerial pointing at Winter Hill in Lancs, but will switch to a more local transmitter after the switchover. This is fed straight into a sky box and then to the TV. Not tried connecting the aerial directly to the TV.
I think this is a common phenomena of other plasma displays, and in all fairness it might settle down with use. Go and focus on this when you audition, because then you will be able to determine if it is acceptable on broadcast television for you (just like you would look for comet trails on an LCD).
Last night I watched some of The Fellowship of the Ring from a Denon 1740, outputting at 1080p. I could see no fizzing pixels, so it is probably just with conversion of low grade SD images. I'm no expert, but the picture from the DVD looked pretty good - bags of detail (TV set to Zoom 1 as the film looks like it was shot through a letter box)
I terms of value, despite the tiny picture flaws mentioned above, I am stil astounded that I got the PX70 for £700 with a 5 year warranty.