Samsung Pro 815 vs Nikon CoolPix S4 cameras reviews
We think that Pro 815 has better screen with 3.5" screen size than CoolPix S4 with its 2.5" large screen.
Samsung Pro 815 has nicer quality pictures (8Mpix). Nikon CoolPix S4 has 6Mpix, so it produces less details.
Optical zoom at Samsung Pro 815 is 15x. Optical zoom at Nikon CoolPix S4 is 10x (which is somewhat lower).