I have updated mine and absolutely no issues. Didn't check front camera picture resolution though.
Edit: Just checked, it is 5184 x 3880 resolution.
Google tells me it is 20.1 Megapixels.
Calculation
Size = 5184 x 3880 = 20113920 pixels
Megapixels = 20.1 Megapixels
Aspect ratio = 1.34