Shooting in 12800 ISO… amazing or just over the top

So I watched this YT interview with Papamichael about how he filmed “The Complete Unknown”, who was interviewed by YouTuber Potatoes Jet. Papamichael shot several low light scenes at very high ISO using the Sony Venice with amazing results. On a BM camera, this image, without the additional lighting, would fall apart. PJ did a quick demo of himself using the Sony FX3 at high ISO in a very low light environment. It amazes me that those Sony sensors are known for how well they hold in very low light environment. But shooting at such high iso and not planning on any artificial lights in a large budget production seems like over the top. Could you do it with a BM URSA or Red Komodo? Great to know if anyone have done this before using non-Sony cam.

