I find a lot of similarities between this game and the other FF games.

The ATB and flow of battle remind me a lot of FFX-2. Changing jobs mid-battle is also X-2.

Crystarium, FFX obviously, but it's more of a mesh between X and XII.

The weapon upgrades remind me of VIII's weapon system which annoyed the crap out me. This one is slightly better because at least you do find new equipment from treasure spheres. Oh yeah, treasure spheres, FFX again...

Controlling one character at a time while the rest follow some AI? XII.

The linearity of the story constantly moving forward on a more or less straight path: X.

Not that this game isn't unique in its own ways. The way it handles summoning is new, among other things. But when you do 13+ of these games you're going to see some similarities.