Well I don't have a problem with power gamers at my table, so the fact that there's a boost in power with Pathfinder, there's no unexpected problems with our game. Since I've published a setting, modules, and supplements using PF, the overall game is balanced to accommodate the differences - so there are no inherent problems.
It's the difference between a 1st level fighter vs. an orc, and Godzilla vs. Mechagodzilla.
Right now the group is eyeing 5e because it's a lot like 3e, but with the power level toned down. The lack of WotC support for 5e is probably all that is keeping us from switching over.
Funny how the two biggest cited reasons for sticking with 3.x are "I've spent too much on 3.x to spend more on Pathfinder" and "5e isn't giving me enough to spend my money on".
To me, "sticking to 3.x" probably includes Pathfinder. If not, it has to exclude a lot of other 3pp support/house rules (such as Arcana Unearthed).