I don't know how you got the colours so dull on the Git2 image, they don't appear over exposed in this image, but I can see that you have used a very different exposure from the other cameras since there is a lot of detail in the dark background which is just pure black in the images from the other cameras.
The other cameras are primarily photo cameras, the Git2 is an action camera using a processor designed for dashcams so intended mainly for video, it is not surprising if the default exposure is different. You need to keep things in the centre of the exposure range for bright colours.