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Just curious, have you noticed any differences in picture output (overall quality, exposure, clarity, noise levels etc) between iPhone 6S and 7? (not the Plus models)

Personally I have experienced none.

The lens is F1.8 vs F2.2, meaning more light, there are also some slight changes to the sensor.
Unless you shoot often in low light situation, the difference will be slight.
Probably impacts video more were low light usually means a huge amount of grain.
 
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