Being someone who can see the difference like night and day, I imagine there must be something that varies per individual... which also makes me feel like you are lying. So I totally understand where you're coming from.
Aside from that, one of the clearest videos I've seen the difference in is: https://www.youtube.com/watch?v=C-dOuBcxMlk - the commentary isn't very constructive in that video but I see a rather large difference between gameplay clips.