I managed to hit level 90 on my paladin last night making it my 5th toon at max level for this expansion and earning me the Quintessential Quintet achievement. It also pushed me over the 9,000 achievement point level, earning me that achievement, which was unexpected, since I don't really pay much attention to my achievement points.
I finished leveling as ret through Townlong and Dread Wastes which worked quite well, but then immediately geared him out as holy at max level.
Interestingly enough, the rep bonuses from Grand Commendations also count toward rep earned while leveling, so I'm just 1,000 rep away from Revered with Klaxxi already.
The next character up is going to be the druid.
I'm also working through rep grinds on my shadow priest as well. I hit revered on Golden Lotus yesterday and so have switched to just doing Shado-Pan, August Celestials and Operation Shieldwall now. Since my warlock is already exalted with all of the original factions, he's just working through Dominance Offensive.