One thing i've noticed after looking at these pics and going back to GT5:P is that the cars look more real due to the reflections on the Chassis and the Windows. If you look closely during Replays, you can see that the actual background is being reflected in real time and with all the changes in shadows, lightning and contrast. That, coupled with the great global lightning system that they implemented, is what, IMO, makes the cars look really fantastic.
The only things I think that have to be upgraded are the amount of jaggies that are seen in some cars (Especially in the Suzuki Cappucino and the Mazda RX-8, or when you're inside the cockpit of the Ford GT, because the shadow cast by the top of the car looks a bit jaggied as well), and the backgrounds in some tracks, especially the far view of the Fuji GT track, and some of the textures in the ground of the Suzuka track, because when you put them side to side with the beauty and almost real like look of the London and Eider Nordwand tracks, they do seem a bit lacking. Other than that, the game looks perfect and handles perfect IMO :)
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"










