You could put it down to a conservative design. One that, by playing it safe, was strong in the early stages before the more daring teams optimised their more radical designs, like McLaren for instance.
There is a fun little theory of mine which says teams like Red Bull, McLaren and Renault are hitting a brick wall with their designs and the development is now tweaking and bringing in new wings. But Ferrari, more of a blank canvas, is easier to bolt new parts onto and make radical changes in direction in terms of R&D development. Informed? Hardly. Any evidence? Not at all. But you know, it’s fun to speculate :)