End of the day you will only notice low res RT if it's on a static feature that is in view such as a car interior in GT7 whereas in R&C you will only notice if you pause and pixel peep since is a fluid, fast-moving game.
I find this whole thing a bit funny - it is like 60 v 120+Hz all over again - once people get used to games which use a fully RT implementation of GI, etc. games that use older or hybrid techniques will look so dated in comparison.