I've now owned one of these sets for about a month now (but only had Freesat HD sorted for a week or so) - so early days..
For the moment I have to say I've been blown away by the settings - with no changes made! (i.e. the defaults).
I fully suspect that this is down to it being my first flat-panel TV... but even so I have to say I'm delighted with it (so a little wary of making changes, for fear of "buggering it up" [technical term!] - when happy with it as-is.
Sorry I can't offer any more. How are you getting on with yours? (sorry, didn't check when you posted this initially).
PS just seen you posted this approx. 6 months ago - going to pop this reply on anyway though as keen to hear how you're getting on!