it seems to me when the next patch comes out with the new ewh stuff, with the exception of the ewh mainhand and offhand, you'd be better off just getting the discounted wh stuff and maxing your stats rather than wasting ranked coms on the ewh stuff thats hardly better.
Don't the better armoring increase your armor rating thus reduces the dmg you take to some degree? However, you're probably talking more about the mods and enhancements. If you really want to think about it, the EWH gear will give you more HP too. It probably won't give you that much more, but it could be the difference you would of have needed in many possible future situations. That goes for the main stat and power ect... Those few stats could mean the difference of a critical turning point in a ranked warzone.