Was just playing a bit with an old file I never had the renderpower to finish. Each one took 6'ish hours to render with PT AA8 and TG DOF.
Both versions have something to like and dislike...
The OCIO_OFF might still have the atmosphere adjusted for ACEScg primaries, perhaps that's why it's so blue, but I can't remember. Thus the comparison is a bit iffy, everything else is processed similarly though.
OCIO enabled...
It seems I'm a bit behind on things...There's no real need to adjust atmosphere for OCIO/ACES, so ditch that part please :)
The vegetation, DOF and lighting are spectacular! The grass is superb.. I wish I could put my finger on the main model with small flowers. They are so familiar.