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Was the even field illumination test done/observed on a FF sensor, such as a 5DmII? Can you run your findings through a waveform? How much is the edge loss? Our eyes do a great job tricking us. From what I could see, I'd say 1.5 stops in the extreme corner, but who knows. The waveform can surely help us see, yes?
Yep. It was done on exactly that. A 5D Mark II. Don't have a waveform here, but my magic robot tells me that I'm measuring no more than a 1.3 stop variance between center and maximum corner illumination. Which to me means you have pretty good eyes
If you're curious the robot says this too.
Red Mysterium-X 5K Full Falloff = < 1/4 of a stop
Red Dragon 6K Full Falloff = nearly exactly 1/2 a stop