i feel the fps numbers don't give you the whole picture. The dx version of BF4 is designed to have maximum rendering performance at all cost, and will dynamically lower quality of sound, physics, and some are speculating even network performance.
So even though you might only have 10% more fps, that doesn't reflect that the quality of the game has improved.
On the other hand, if the game is running on windows 8, and the benches are for windows 7, than the modest numbers are actually exaggerated, since this game has a dx11.1 path.