Its a bit dangerous to start picking holes in the picture performance of a TV based on one programme. There are too many other factors at play beyond the scope of the TVs own processing or adjustments such as the production quality of the programme and how much compression is being applied to that channel at broadcast. You've also said yourself that the TV hasn't had any settings adjusted, so it may well be that if it is still on default settings so there's possibly too much processing being applied; this is particularly the case if the set is in some variant of
Dynamic mode.
I'm not quite sure what it is that governs the mentality, but it is so often the case in forums that a TV buyer spends hours reading reviews and seeking advice about the best set to buy, and then trawls the web to screw down the absolute lowest possible price to the point where it almost becomes an obsession. Yet when it comes to the all-important part of setting the new TV up properly so that they're then getting the best performance from it they'll do everything possible to avoid spending a tiny fraction of the money saved on a proper set-up disc to help them get the most from their new purchase.
It usually follows the same well worn path: The buyer asks "
What settings are recommended?", and when they finally understand that plugging in someone else's settings simply introduces more random errors so can be just as wrong as not setting the TV up at all, then the next question inevitably is "Where can I find a free test pattern?"
Test patterns do exist on the web of course, but they're only part of what's required to complete the job. There are also optical colour filters that need to be used and these are something physical.
Make a relatively small investment in a set-up disc such as
Disney WOW,
DVE HD Essentials or
Spears & Munsil. Each of the discs includes the tutorials to show you how to make the necessary adjustments and what to look for. The discs can be used to set up other TVs in the house and future TV purchases too. The other benefit is that once you've seen the difference it makes in setting up just the basic user controls then you'll become a far better informed and much more discerning buyer next time you're looking for a new TV.