I mean a
huge example would be Driveclub game got a
huge graphical upgrade, everything from higher textures to better normal maps, global illumination, advanced weather systems, drip maps, reflections shadows and improved lighting but most gamers didn't notice it, maybe cause a lot of gamers think crushed blacks and or certain lighting affects look better then others kind of like console gamers who claim they cant see the
difference in 30 and 60 fps or even weird cases of gamers saying 120 fps is not noticeable or even worse then 60 fps.