it doesn't in GT Sport, there are only additional DoF effects. If anything, the most impressive GT Sport footage has been in-car, the lighting is adding an almost photorealistic look to proceedings, even in daytime conditions and city tracks. These are two of the most difficult scenarios to avoid that flat, videogamey look, and why so many titles resort to extreme weather conditions and additional trackside 'decoration'.
While it maybe a stretch to say GT Sport is (graphically) a generation ahead of PCars 2, it certainly looks like the kind of difference between an early cross-gen game, and one built at the end of a gen, with 1st party support. Even screenshots don't tell the whole story. In motion GT Sport is in that uncanny valley where it could pass for real life. PCars 2's style, materials, shaders, effects etc., remind me of the GTR 2/NFS Shift 2 era. Obviously everything is dialed upto 10, but there's no mistaking it's heritage.