You're missing what I'm trying to say. I'm not saying that I only ran the test with RC off. I'm saying that even with RC turned off (which I know is different from having it set to 0), upscaled 1080p on a 4K projector looked better than native 1080p on a 1080p projector.You don't want RC off you just want it set to 0. There's a difference and if you turned it off then you missed out on a much better PQ experience the Sony could have given. How did you have this set? Off or zero? Options to do both are available in the menus on the Sony.
I ran this test several times with different settings. I ran the projectors with detail enhancement turned way up, and again with middling settings, and again at very conservative settings, and again turned off.