More complex cameras have greater dynamic range, thus better capturing both shadow detail and not blowing out or washing out the highlights (lightest parts) of the image.
They also have better image sensors which means less degradation in low light situations, less graininess, and with better lenses, less distortion.
They also have better image sensors which means less degradation in low light situations, less graininess, and with better lenses, less distortion.
My take, anyways...