The reason why Sasuke won at the final valley was because Naruto could not bring himself to strike Sasuke down (for sentimental reasons). Sasuke couldn't kill Naruto because he knew Naruto held back with the rasengan (pride). Sasuke is the looser, he knows it but won't admit it.
Someone please let me know what is so special about the EMS. As far as I know, it means that he will be able to use his advanced sharingan techs without going blind. Again nothing special. Uchia are all loosers, except itachi, who will pwn Kabuto real soon. I can't wait.