Sakura is now really close to surpassing Tsunade.

[Shadow Abyss]

I don't wanna be annoying, but one must to do much better than beating a Zetsu clone to impress me. I'm not saying Sakura is weak, she showed stuff against Sasori, but she didn't enter an actual fight since then. A Zetsu clone is too weak to count as a challenge.
On the other hand, Kishimoto has finally shown what Tsunade can do after the fight against Madara and I can say for sure she is way above Sakura's level, both in medicine and fighting prowess. I can't see Sakura tanking attacks like she does in her current level.