Then:
Explain to him how he's wrong about the ugly noise texture in all MX footage, especially tungsten-balanced, making the image look cheap and chunky and digital.
Explain to him why the shadows get so chunky and blue in any tungsten-balanced Red scene, whereas Alexas can be shot under any lighting condition. And then go on and add why the Alexa's superior low light ability is irrelevant.
Explain to him why it's irrelevant that the Alexa has a smoother noise texture, much more like film.
Explain to him why, despite the Red's 13.5 stops of DR being is a total lie (in fact the camera has no more DR than the C300, less than the F5, and a magenta-tinted highlight rolloff), it's still better than the 14.5+ stops smoothly handled in the Alexa.
Explain why the Alexa's superior midrange tonality isn't significant.
Explain why red code botching details in skin and foliage (again, some of the most emotionally resonant subject matter...) is irrelevant, whereas ArriRAW is fine and even prores handles these details well.
Explain to him why the color science of the Alexa matches 5219 almost exactly and offers smooth creamy flesh tones and beautiful green foliage, whereas the red totally botches memory colors, but that's ok.
Explain to him how he's wrong that the OLPF of the Red offers ugly internal reflections and color cast over highlights, whereas the Alexa rolls off smoothly like film.
I'm curious. Explain how an ugly image with good specs looks better than a beautiful one with somewhat lesser specs.
Personally I would shoot a C300 or F5 over an Epic; the Epic has a stranglehold on summer blockbusters for the resolution advantage, but the look is just so... ugly and the workflow so damn shitty.
Yes there is beautiful content shot on red. But Prometheus, for instance, required a lot of CGI lipstick to dress up that pig.
I do find the character of the Monochrome sensor to be superior.