S7, S7 Edge, Note 7 use a Sony IMX260 or Samsung S5K2L1 sensor. Assuming they are pretty much the same, the Sony IMX260 in the
Chipworks S7 Edge teardown measured in at 37.1mm^2 You were right about the
iPhone 7 camera, it is indeed 32.3mm^2. The 6s/SE camera is 29.1mm^2, I wonder if the difference is because the 7 camera has OIS.
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Also, keep in mind that the Galaxy S6 camera was a 16:9 aspect ratio instead of 4:3. The S7 is now 4:3 just like the iPhone has always been