[batat]

So far AI did a terrible job there: https://imgur.com/a/CJ7NU5w

Original scene was far from perfect, but it was somewhat more consistent: a sunny spring day, warm tones, noon, some sun rays casting deep shadows on the face (traditionally the worst time for outdoor portrait photography, hehe).

With "DLSS ON" it's something like an overcast sky; there are some flat shadows on the building in the background but the shadows on the building on the right are still just as sharp as before; the overall tone of the scene became colder; sun rays on clothes disappeared but there still deep shadows on man's face as if the sun was still shining from above, and the tone of his face is basically the same, despite the new color balance.

[cubefox]

In the original the man has a large sun shadow (from an off screen object) on the right side of the face. This is gone with DLSS 5, making the face no longer look lit mainly from the left. Only self-shadowing remains. It seems DLSS 5 is working with screen space information only, which means it doesn't know the position of any off-screen lights, which in turn seems to bias it toward an overcast sky look with omnidirectional light and without sharp sun shadows.