King's Field 4 looks alright i guess, but the game has always been rather blurry when turning, still shots look fine though.

Yeah, even my actual PS2 copy has some kind of primitive motion blur. It's different from ordinary interlacing blur, as you can clearly see it kick in when you rotate the camera, but not when you strafe side to side.

It also occasionally freaks out on actual PS2 hardware and gets super blurry for a second, so I'm really not surprised it doesn't emulate quite right.

However, certain emulator settings can stop it from getting more exaggerated than it was on PS2 hardware. I just wish I remembered the settings.

Software mode had no bugs last time I checked either way, but hardware mode can make the blur much more severe.