Got around to testing out the redux mod. First impressions: not impressed.
I've tested the "Redux original" and "Redux light" reshade options and as predicted, they are totally crushing blacks and losing details at night. Also the ENB anti aliasing function plain does not work, and if I edit the sweetfx file to apply SMAA it generates a compilation error, and doesn't work.
Daytime looked no better than my own reshade/ sweetfx profile (in fact looked much worse and slightly cartoony and overcooked), and I'm not particularly a fan of the new road textures either to be honest.
My own reshade sweetfx profile with the default GTA5 is far nicer, so don't know if I can be bothered with this to be honest.