Calibrate it. You'll be amazed at the picture and energy consption improvement. Same with all TVs when first brought actually.
How?
Perhaps there should be an entire channel devoted to the Test Card.
Having been a Sony-only person for over 30 years I bought a Panasonic a year ago, and am pretty happy with it. Picture endlessly tweakable, sound slightly better than average, looks good when the signal is poor, even on HD Freeview.
But I agree with an earlier comment that the Panasonic EPG is just terrible. And the EPG is an important part of the TV IMO, this alone would make me look elsewhere next time I buy (unfortunately in Curry's etc the EPG is not something you can view).