I am going to try turning off the automatic selection of either 1080p or 4K and just trying 1080p and see if that solves the problem. It could also be the refresh rate and I can change that on my TV for that input.
i absolutely see what you mean, and started really bothering me since i bought a 65 inch tv. the artificial, overemphasized edges, the almost animated color tones on faces, the smudged look of background.
and its true, its not tv-related or app related: i tried several apps and 3 different tv's at home. the same effect is always present.
my google tv and htpc both produce superior images.