Yes there is a big difference in the 2 sensors, bigger visual than the pixel count is.
I was expecting the front feed to be even more washed out than it is due to the rain.
It do seem like the F and R feeds are not in sync, cuz with a oncoming car i can see it on both cameras at the same time, and also the Audio you can hear a delay in if you put a F file and a R file together and leave the audio in both tracks.
I am not sure how it is with the I camera i have not focused much on that aspect of the T3 as i get about as sick seeing myself on camera as i do seeing other people in selfie mode.