KH 4 graphics look good. But, I'm not sure if I would get used to playing KH in levels with modern city levels because I only played KH 1 and 2 which mostly had less-modern levels from movies like Hercules, Mulan, Tarzan, Aladdin, etc.
I feel I prefer the older 3D graphics of Kingdom Hearts 1 and 2 on the PS2 because the animation is not as realistic, so they mix well with Disney 2D kids cartoons like Aladdin which were not very detailed cartoons .