I have the Z 6 polar. All I can say is, that for its price it delivers, but not out of the box.
The internal player is crap though, even using Kodi. It ll not looks bad, but wait until you hook up a good mediaplayer, like Zappiti or dune, it is another world. Contrast, blacks are much better. You can change the color settings, if you go in general menu, under brightness, and not video. I tempered the blue a lot, put back some green, and the image is much more natural, put sharpness rather low.
Yes the sound is not 100 % right, there is a lag. But for the rest, with some tweaking, using an external player, it is o much better then out of the box....
I like my HT, wine and pretty girls. But...am I the only one