What is the absolute best S35/APS-C sensor for low light?

[Geffen Avraham]

I am looking to shoot an feature in low light with 20x zooms (which exist only for 16mm or B4 sensors) - necessitating a small-format camera with good low light capabilities to compensate for shooting at slow apertures.

What's the best camera for shooting a movie at ISO 12800 in S35? Phedon Papamichael shot A Complete Unknown at high ISO on a Venice 2 - one of Sony's legendary full-frame low light cameras.

Is the answer to use a Venice or A1 II 8K FF camera and crop? A Red Gemini? An inexpensive Fujifilm mirrorless like the XH2S?

I'd love to hear if anyone here has done something similar.

[Aapo Lettinen]

Definitely use a Sony for that. And as modern as possible.

 

Gemini was ok when it came out but is no comparison to current tech

[Michel Rabe]

There's also Alexa 35 with the currently best latitude (and highest dynamic range), making it possible to pull up shadows from many stops under.

Definitely not RED.