Take it from someone who has done both the a7c+chinalens thing, and the zf+"but the 50 is the shaarpest" "but the 40 is smaller" thing
Ignore
>>4473755 . The specs do not matter. The a7c is noticeably smaller and more portable. It is also more affordable. If you know how to use a camera, ie: you already know how to shoot film and can rely on shutter speeds <1/30, they both do the exact same thing. I would rather buy a D750 and a small tripod than another ZF. It's an absolute meme (it also feels like cheap shit and the "better EVF" doesn't actually feel that much better in practice because its still an EVF)
The ZF is slightly better for pixel peeping finely detailed things because the AA filter is less aggressive and there's 10% less noise but that's about it. That doesn't really matter. You could shoot living things at 1/15 all day and no one would notice or care about the minor blur (picrel) because everyone views on hidpi phones and retina display equipped laptops instead of zooming in 300% on 4chan.
I don't even think the zf or a7c are even better than the other for jpegs/video colors. They are basically the same fucking camera with a different sales pitch. 24mp full frame is 24mp full frame stop being a fag.