I just used the THX Optimizer included on one of the movie discs. The picture looks pretty good. I'm sure that the calibration discs will have more images/tests to fine tune the settings further. Just wondering how much better? Anyways, I'll search around for a calibration disc.
One thing I can't figure out is what I see might be good to me, whereas others may not like what they are seeing or vice versa. I think it all boils down to what is pleasing to your own eye. Pretty sure not everyone sees the same red, orange, etc. What's to say that Panasonic's red is a few temperatures off of what Sony sees, or Samsung, Hitachi, etc. Too many variables.
This probably goes the same for audio. Not everyone has the same dynamic range in their hearing. I've had a hearing test done recently, I can still hear the upper range of trebles but not at the very high end of the spectrum. Anyways, I dialed in the settings for my system. Changed the speaker mains around and made the front soundstage wider and moved the sub again. Sounds decent, but going to try and play around with the settings again with a meter.