Most mammals cannot see colour. The humble goldfish can see across a wider range of the visible spectrum than any mammal including us.
Many insects have multiple visual pigments.
Furthermore, in some respects some molluscs have eyes better designed than vertebrates. In vertebrates light passes through the neural retina before reaching the photoreceptors. This must lower the quality of the image. The other consequence is a blind-spot where the nerve fibres leave the eye. The octopus does not have this problem.