I am also looking for 4 K Smart TVs and all TVs affordable up to 1000 euro is on beginner level . I have been told and read that KU series of Samsung has juddering issues . You can google Samsung juddering and you can see comments about it . I was going to buy KU 6400 and that ' s why I changed my mind . LG ' s beginner UH series has local dimming feature which is a problem which causes lighting issues like black turns into gray because of backlight and turning it off completely messes up with black color more . My only hope was Sony TVs and their 700 D and 800 D series has IPS panels which is also not the good . KU series has 8 bit panels which is not real HDR . If you want real 4 K quality then you should look KS series of Samsung which is expensive . Good luck