I am not a lens specialist, but...
In the FW059 pictures I see also some vertical stripes which I consider are coming from the CMOS image surface which is not perfect neat (polished). I am not blaming the sensor here, but my idea is that when the brightness is added too much by the firmware we will see that lines in dark conditions. I remember I saw lines like that in a korean camera called Livue LB100 which is supposed to have some better korean CMOS lens module.
My idea is that even the firmware can add brightness, the lens to be japanese, if the sensor is not good for low light conditions is not so much to do regarding the night mode.
I expect bigger sensors to have tiny stripes to make them almost invisible.
As a developer I would pay more for a bigger sensor than for japanese lens which is expected to be expensive, but using some good quality taiwanese lens. I think even iPhone is using taiwanese lens on its camera.
I consider for dashcams at least 1/2.7" CMOS sensors to be used, because we need details like characters from car number plates which are already smaller because of marketing wide lens used.
enjoy,
Mtz