There are several such reasons for the inconvenience in the look of a 4K TV that include;
Your new 4K TV deserves such good 4K contents. If you don’t have any 4K content to watch, a 4K TV can never look its best.
If you still have an old DVD player and standard HD set-top box channels, then 4K TV display looks quite soft and blurry. The reason behind that is the extremely higher resolution of your 4K TV.