i like to keep in mind that colours are still subjective. "real" and "not real", or "right" and "not right" are illusions of the mind. make it look how you want it to look, unless you're aiming for journalism rather than art. we're not stuck with using certain films anymore, we can make an image look however we want! many people loved/love velvia, but there's nothing "real" about velvia's colours. but i do find having accurate colours to start with makes working with images much easier, ie. profiling your camera.