FYI the LG TV I commented on above was a LG 55SJ810V, so probably similar to the first model mentioned above. I do like the UI and remote too (even though I've switched to a
Neeo universal remote for my sanity).
Also worth considering is where you get your content from. The only DV content I have is via Netflix, and while it looks great, the video can still suffer from graininess in dark scenes. (I'd guess this graininess is just macroblocking compression artefacts, just smaller blocks because of the higher resolution). It's very noticeable in dark scenes in Star Trek Discovery, not noticeable at all in Lost in Space (possibly because the scenes are generally brighter?).
From what I've seen, the DV (or even just plain 4K) streams don't have a massively higher bitrate than 1080p or 1440p, so they're likely at a much higher compression rate.