I think it depends more on screen size. On 58-65", hasnt been hard for me to form an opinion Directv looks better overall. Id not use way behind, but I think a lot of times when its stated there is not difference, its folks watching a 50" or less from 10ft away.
I record the same shows year after year on channels like Discovvery, TLC, History and Nat Geo, and they look better on Directv on my 64". Also, PQ is so subjective, but to me, Im very picky.
Im one of the first ones to bitch about the HBO pulse on Directv, when everyone else was saying it wasnt happening. Then over time more people noticed it, and now its fixed.
Ive also been claiming over the last two years, Panasonic plasmas have gotten worse on IR, and thats just not coming to be accepted by many. I think a lot of people look the other way, and then a lot of people dont know what they are looking at.