Pathfinder didn't really change the tier rankings much. The exception being Paladin which *MAY* go up to tier 4, it's kind of useful in its specific niche. Ranger, Rogue and Barbarian don't go up a tier but are now much stronger in their Tier.
I remember people saying in the Beta that Tier ones got stronger, but it was only generalist Wizards. In the final tier one's take a very minor power hit, with druids getting the worst of it with the Wildshape nerf.
<Controversal Statement> At least Pathfinder didn't make the rift in power between Tiers 1 and 5 any wider. </Controversal Statement>