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It's likely pitch black to the human eye, except for the stars. We have Sony A7s, which goes to ISO 409000, and it already is close to night vision, way more sensitive that my eyes, especially paired with a f1.4 lens.

This camera goes to ISO 5 million, which is awesome.

Well there is this side-by-side comparison with other leading lowlight technologies https://www.youtube.com/watch?v=c_0s06ORTkY

For the first case, I think you want a view in normal lighting conditions, and not the low-light view of the scene. What expectations of a well-lit scene would look like in regular balanced full color (cloudless summer noon daylight or similar), and then the enhanced color low light version (overcast, moonless star light).

A split-screen view, with half the screen in pitch black wouldn't illustrate much.