i dunno, i always think of light as a seemingly infinite amount of waves
all-else-being-equal (and its NOT) the more sensors you have that can record it, the better, because you then you have cropping/zooming ability, and more information to work with so things like colour gradation work better.
if you have 2 pixels in a square foot, gradation from white to black is well.. very plain.
if you have a billion pixel in the same square foot, gradation is much finer
ofcourse... at that point your eyes wont be able to tell between a million and a billion... but its still cool to know that its there