I did Layer3 TV's 2-week free trial in August of 2018. I had both Dish and Layer 3 running concurrently. Using a 1080p source on a LG 65 inch OLEG TV, I could not see any difference in picture quality between Layer 3 and Dish.
I find this incredibly hard to believe as I currently have Layer3 and Dish and Layer3 has an obviously better picture quality. I as well have an LG 65 C7P OLED. The settings are identical for both (both running through my AVR).
Dish
Layer3
The players have no faces on the Dish feed. Look at how the left most players arms almost aren't there on the Dish feed.
I have done multiple comparisons between the two. 720p feeds look closer (though the grass on Monday Night Football actually had definition on Layer3) but the 1080i channels on Dish don't even compare. Dish is clearly still doing HD Lite for them.