Pathfinder vs. 3.5

[Saya]

Cleric is shoved more into the healbot role with their positive/negative energy bursts and the removal of their heavy armor profs. Domains are now a little weird with two abilities instead of one, which are granted at 1st and 8th level. And turn/command is now a feat instead of a feature.

Paladins are much more useful as mountless paladins are actually somewhat more viable and smite is much stronger.

There's also the feat/2 level progression which does funny things.