So far, We have not seen Sasuke's full blown power yet after he awakened his Eternal Mangekyou. I'm pretty sure he will have Perfect susanoo, and he will surpass Madara (Madara in his prime).
Another question is. "IS there a fourth power after Susanoo granted by eternal Magekyou?" I remember during Sasuke's fight with Itachi, Itachi said that the eternal Mangekyou will unlock another power. What do you guys think???