there are other models in larger format
I know but they only have 1/10th the sensitivity from the spec sheet I've seen. Here's the full list of Sony Sensors for Surveillance from the google search I did:
https://www.sony-semicon.co.jp/products_en/IS/sensor0/products/cmos.html
If you take a look at the individual product sheets for 4K sensors, you'll find the older larger sensors are less sensitive than the 334 / 335.
It's funny how they separate sensors out for surveillance, cameras and mobiles though. You'd have thought there was a crossover. I'm pretty sure (although it is am intelligent guess), the Panasonic Lumix GH4 uses the IMX159 processor and the new GH5 the IMX269, just comparing the few specs I can see (from the camera (product sheet). The GH4 / 5 are 2 of the best low light cameras available although the Sony A7S II is my personal favourite. However, I'm pretty sure the A7S II is using an inhouse sensor. ie one reserved for Sony product lines only.
This does raise some questions for me though:
1. Why can't a camera sensor be used in a video surveillance camera - after all the video from the top DSLR's rivals some of the best dedicated video cameras these days? Surely a sensor is a sensor and all the bells and whistles seen on DSLR's come from the additional add on circuitry and not the sensor itself (I wouldn't know for definite as I'm an amateur not an expert).
2. If I'm right and the IMX159 is the sensor used in the GH4, then surely now the GH5 is released, the IMX159 will be falling in price, and even if it isn't and scheduled maybe for eventual obsolescence, couldn't Sony be persuaded to make this available for surveillance use at a reasonable price?
3. Would the lens be reasonable in price to enable a 4/3rds sensor to be fitted to a dashcam?
(Apologies to Viofo here as this goes slightly off topic into a more general discussion of sensors).