I can tell you why it blanks....its on purpose. Post Apocalyptic power grids. Watch it again and listen as you hear it ever so slightly making the flicker sound of the power going off and on in a few milliseconds.
I wont propose its in the same class but having previously owned the 70 inch Elite (I know its a problem, I admit it)
I can tell you that a properly calibrated 90 (or 844 for that matter) will come very close in a lot of categories. Black reproduction being the farthest of course.
Just my two cents.
And you believe best buy....... quattron is the 4th pixel (yellow) and is regarded by many to have no benefit and difficult to calibrate over the standard 3 color. Hey at least they aren't trying to sell you the more expensive set I guess.....
as an owner of a 632, 844 and now 90.... I can say hands down the 90 is at the top of the food chain pq wise. I have seen the 75 and its obvious the edge lit is not going to compete with the full array