I am curious though on how Daz/Croco have established themselfes in the NW, There is no doubt in the fact of their Power increase. The question is.. on which level are they by now?
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Zoros' Asura seems like a stronger attack then Sanjis' Jambe.
Obviously Sanji is the weakest of the Monster Trio, the only question in my mind is how close is he to Zoro and how far is he from Franky (the 4th strongest in the crew imo).
He was able to fight Vergo for awhile, I don't know if he could had ended it (probably not since he was acting like his legs were getting hurt) but even if he couldn't outlast Vergo, his skill level was the same - In my opinion in terms of skill/abilities he is on Luffy's/Zoro level, just he isn't able to take the beatings they do and keep fighting.
So yeah, I wouldn't rate Zoro a A and Sanji a B+, maybe a A- but only because he is more squishy (although he is tough, don't get me wrong - I'm comparing to Zoro who is more of a tank then General Franky lol)