Statistics are up, so far SGE and WHM are the top for rdps. Sage is more popular in EX than both SCH and AST combined.

Buff healers will likely pull ahead later in the expansion since raid buffs scale well, but for now they're lagging behind. As predicted, Sage and AST are the strongest in terms of overall heal power, but the EX's don't really require GCD healing regardless of your comp so that doesn't matter yet.