Pq has improved from last year when I had Sling. I had a free trial again last week though I have no idea of the bit rate comparison from then to now.
It's very close to Vue but not guide there yet. Sling was definitely better than Directv Now (when Now was working). All viewing was done on Amazon Fire TV.
Watched some of the TNT Knicks-Warriors on both Vue (PS4) and Sling (Roku). PQ was far better on Vue, satellite quality, in my opinion. Sling PQ, though clear and free of artifacts, was flat, as if you were watching a film. Of course, both were better than Mediacom, which was full of artifacts and pixelation. If I can figure out a DVR replacement for our local channels I will probably dump cable in 2017.