The argument for haste is the same as before, it's a good throughput stat. Now however, Sanctity of Battle reduces the cooldown on Holy Shock which is great (we all miss T14 4pc, right?).
In 5.3 and really all throughout this expansion, I've considered crit to be the worst PvE holy paladin stat. In 5.4 though it looks to me to be the most appealing one. A high crit build with the new T16 2pc (Infusion of Light also increases the healing done by Holy Light, Divine Light, and Holy Radiance by 25%.) can be a really powerful combination. More crit = more IoL procs = more fast DLs + now they are 25% stronger. On the other hand it could lead to more overhealing / mana drain.
What do you guys think? Anyone have any hard data? While I follow and keep up with the super hardcore theorycrafting, I'm not one for spreadsheets.