PS5 runs at consistent FPS in RT mode and performs better than Series X.
PS5 runs at more consistent FPS in 120fps mode and performs better than Series X.
Series X has dips in high 40s to mid 50s in RT mode and isn't very responsive.
Series X runs much better in 120 fps mode, but can dip to mid 90s but VRR saves the day.
Series S has not so favorable fps performance from the only available mode.
PS5 has good implementation on the DualSense as well.
PS5 and XSX target 4K on both performance and RT modes at 60fps, PS5 seem to hit native 4K on both these modes.
PS5 and Series X both at 1296P with slightly above or below that depending on-screen complexity when running at 120fps mode.
Series S runs at just a single mode which is 1440p60fps and it's FPS isn't smooth.