Retinal neuroscientist Bryan Jones compares the iPhone 5 and 4S displays under a stereomicroscope:
It turns out that the pixels in the iPhone 5 are precisely the same size as the iPhone 4 pixels, but the iPhone 5 pixels have better color saturation with more contrast, seen particularly in the blue pixels. I did not calculate the difference in color saturation between the two iPhones, but it is pretty clear to the eye which is which. Apple claims 44% increase in color saturation and from these images, I believe them.
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