4>3>1>2 for me. 4's just the strongest game in terms of everything, like name any aspect of King's Field and it's just at its best in 4. One of my favorite PS2 games and one of my absolute favorites period. Okay the final boss kinda sucks compared to even the first game and the turning speed is very slow but that's about it, everything else is top notch
https://www.youtube.com/watch?v=KUXsDIylp34
It's interesting how all of the other PS2 FROM games suck ass compared to their PS1 predecessors but with King's Field it was actually the opposite, they just went all out