Well no... There can definitely be variance with the items in that they can be designed for different skills, such as an example for the crusader the Mortal Drama, Blade of Prophecy, Fate of the Fell. Or, the blacksmithing legendary weapons, which give 15-20% to an element, which is what rares won't do.
There can be several different options, from which you can choose, depending on your spec. They just don't need to be "overperforming", or bugged like the Shard was.