VIZIO has some of the best PQ in TV.
Every category of size and Model ranks in the Top 5 CNET reviews.
1st ,3rd,and 5th
They are far from an economy TV.
http://www.cnet.com/topics/tvs/best-tvs/
Dish HD PQ is bandwidth starved and the 1080i is 1440x1080 instead of 1920x1080 full res.
This gets very noticeable on large tv screens.
The HD PQ I get from my Cable company just through the coax is better than Dish HD.
But definitely not a deal breaker.
If I didn't see a comparison on a daily basis, it would be hardly that noticeable most of the time.
Samsung Galaxy S6 Active