>>4093319>>4095204Totally figured this was bait, but on the off-chance it isn't you are just wrong about things. The a7s models are great in low-light for video, but actually worse for stills than the a7r line in terms of noise.
There's nothing special about the x100f lowlight performance either, picrel. The X-T2 / Pro-2 / H-1 / X-T20 all share the same sensor and processor, so you'd get the same IQ, but have the option of changing lenses too.
If you take pretty much any modern interchangeable lens camera and simply get a faster lens, it will then also perform better than the x100f. Lenses often make a much bigger difference for lowlight performance than cameras itself.
Caring about 50k ISO quality is dumb too, and should be a sign you need better lenses and especially better lighting. I have one of the best lowlight cameras, and rarely ever need 25k, let alone 50-100k ISO.