There is a great post on healer evaluations in 5.2 by Luumis (now with Exodus, formerly of Vodka) after the first week of Throne of Thunder raiding. You might remember his pre-Mists evaluation from the PTR, and it turned out to be pretty accurate, and the new 5.2 evaluations are pretty accurate in my opinion.
It is about time for me to give you my thoughts on the status of healers as of the current build on live servers. When you read this ranking/evaluation, please keep in mind that I have been limited to only 25 man normals so far with limited 25 heroic testing. I have seen what the boss mechanics are like and so can get a pretty good idea of what to expect. When I go over each class, I’ll talk about how each healing class will fare with current gear and with the next tier. In most top progression guilds, healers aren’t given gear since gear on dps has a greater impact. As healers, we’re expected to make due with what we have at the start of progression including friendly/honored reputation valor items and the gear we got from the previous tier.
How does he rank them? Exactly how I would have ranked them! He gives top spot to Holy Paladins, then Priests, Mistweaver Monks, Resto Druids, then Resto Shamans bringing up the rear.
I always find it interesting that gear is always steered towards the DPS in top progression guilds, but when you consider how long they have the previous tier on farm for, there would be little reason that healers wouldn’t be storming into 5.2 with full heroic BIS from T14. But then of course, you wouldn’t have the problems lower end guilds face when they don’t have the previous 16 bosses on farm and where raiders might be less dedicated to capping valor.