I got my iPhone 4S on launch, upgrading from my old 4, and almost instantly, I noticed a difference in the screen. On the 4S, I can see pixels, whereas on the 4, I could not. A lot of people in my family have the iPhone 4, and when I see their phones, the screen always looks much crisper and easier to read. I'm not sure why this is. Has anyone noticed this, or is there an explanation for it?