Board Thread:Theories and Speculation/@comment-26388300-20150611222229/@comment-5936871-20150612171340

Sakura, just like Naruto and Sasuke had surpassed their sannin senseis. She surpassed Tsunade once she completed her Strength of a Hundred Seal during the war, and in Gaiden she's definitely surpassed her. So yes, Sakura is Kage-level just like Naruto and Sasuke.