So... I tried the dashcam last night, compared it to a no-name Chinese brand which is using Novatek96658 Chipset and advanced Sony Exmor IMX323 sensor.
I was SHOCKED. The 70mai pro which has a better sensor almost didn't capture anything, while the no-name captured way more. I will do a full comparison this weekend when I will be taking both the cameras for a low light event, but for now I can only say that I'm utterly disappointed by the 70mai pro.
It could be of course the multipatch V5 that caused it - but even if it made the video a bit darker there is no excuse to the major difference.
My conclusion is that while the Sony sensor is the same, the image processing chip which this camera has is simply not good enough. It might have a lot of bell and whistles for other elements but for video processing it is crap when it comes to low light.
really sad!