Well the Star Wars split screen showing the difference in contrast/ black level was taken from the same source (Blu-ray played from my Sony 6500) at the same time using the extra output on my receiver with me blocking half of each projector lens. (Although, sorry I could find any wood so I used felt wrapped cardboard.

).
The Martian shots displaying the resolution difference were taken one right after the other on the same screen but using the x800 for the uhd copy and 6500 using the standard copy. I have quite the setup here.