What "Power levels" are you guys talking about, everything is usually fucking explained in Naruto. Powerlevels have never been mentioned, not once have i seen Naruto just stand there and take a 2 hour beating like it was a two hour tickle fest as you see in dbz because of a silly "power level". To me it seems like you guys are using the wrong word. Sasuke's eyes as already stated above, only gave him more insight. And they did NOT appear out of no where the curse seal helped him with that as mentioned in the manga. The fox seems to be gaining a upperhand no naruto slowly, we do not know if the seal will ever come off completely or if there is a double-edge sword to it that affects only naruto personally.

Also what the hell? Powering up in which way you're all using it (DBZ) is standing there for 30 minutes grunting with a huge aura, NO one has ever done that in naruto. Kyubi chakra is just an effect, it's so massive that it's visible with life protecting Naruto. As for naruto not being able to deflect sasukes hits with the chakra, well he could see his movement before the chakra "reached and wrapped" Naruto's body it looked like (Not that sure, but it sounded like that from him explaining). It's a wonder i havent found any "OMFG DMC (Devil may cry) = DBZ!!" because of Dante's "powering up" as the game progresses and Devil Trigger, you silly people will always compare and look back at the first chance you get. Was it really that traumatizing? Dragonball Z i mean, you tell me.