Well in the patch notes, they only mentioned the destination background:
Sapienza Menu
We’ve updated the Destination background image for Sapienza to better reflect the current lighting.
So I was under the impression that they just changed the picture to get rid of the horrendous yellow-green filter that the map had when H2 released, and that “current lighting” is the one the map has had afterwards and upon H3´s release. But then again, why change only this one and not the others as well? (I believe it was you who pointed out it makes it look inconsistent now?)
So by “current lighting” they also may have well meant this new patched(?) look which was left completely unmentioned. I´m hoping it is a mistake… @Clemens_IOI @Travis_IOI Could you shed some light on this please? (pun - surprisingly - not intended)
I have yet to play Bangkok, Colorado, and Hokkaido in H3, so I´m curious how different they feel. Especially Colorado, which in H1GOTY and H2 felt visually a lot like Paris. Fingers crossed for an eventual mod with the OG Sapienza clouds/skybox though 
It´s indeed “only” 5%, but that apparently is enough to make my eyes sore and my gameplay experience suffer, almost being unbearable at times. And it´s not so much about the aesthetics as it is genuinely being uncomfortable, as if my laptop auto-decreased brightness and I couldn´t adjust it to a suitable level 
Well, there was no reason for it until the patch… 
Yeah that might be necessary… Better get ready to pull a Van Damme on this one 