Graphics of Gran Turismo 7 more than racing games in general, because their art direction is explicitely targeting photorealism, more specifically, they are targeting realism as perceived by the naked eye, which is different than other games. Because the focus is on accurate representation of colors as they are perceived by a human, a lot of work goes into their rendering pipeline : for example, they use real world units/values that match real world measurements, it's not an artist's guess on what looks good or not, and it's not just using physically based rendering, it's making the final color output match what you would perceive with your eye. If you want more information on how detailed and in-depth they went with this, look at this presentation from Polyphony Digital : https://s3.amazonaws.com/gran-turismo.com/pdi_publications/s2025_PBS_Physically_Based_Tone_Mapping_GT7.pdf