Point out where I said Sanji will be as notorious or more notorious than the PK, all I said was Sanji will definitely live up to that declaration to some degree and it's certainly not just some bluff as many here are claiming. Oda had Sanji say this in arguably the most significant moment of his in the pre-timeskip, knowing how Oda treats his main cast, there is no way you think that statement means nothing to Sanjis future and it can certainly be that he plays the most significant role in dismantling the Navy, not in terms of strength but possibly ruining their reputation, using that tactical wit of his to deal a devastating blow to the Marines which is something Luffy and Zoro cannot do, they can beat up some strong folks but so can Sanji and if he defeats an Admiral AND pulls off his most significant checkmate in the story right after then he can easily be the most troublesome of the crew to the Navy.
Also Sanjis notoriety will undoubtably be comparable to Zoro, you know with them always having close bounties and being the wings and all, but just like a lion is stronger than a soldier in sheer power, a man is still more dangerous/troublesome because of his utility and intelligence.
I didn't necessarily mean you, just anyone who supports the idea that Sanji will seriously make good on his quote. Of course Sanji will have importance because like you said, he's in the main cast. But no he won't have more to do with destroying/damaging the navy, his tactical ability isn't nearly as good as you make out, nor is it the main aspect of his personality or his dream.
Unless Sanji gets a real title, or there start being serious parallels on the level of Shanks/Mihawk, Roger/Rayleigh, or any other insanely notorious trios that would include Sanji, he isn't going to be as famous as Zoro, whose actual dream includes his name reaching the heavens. It's bias until you can actually prove otherwise. Hell if you could even give any real incentive Sanji has so far to oppose the navy like that let me know, because as far as significant moments for him in the post-ts go, none have built a case for him against the navy.
As far as bounties go Sanji needed an arc dedicated to him and devoid of Zoro to bridge the gap as a gag, their hierarchy in terms of matchups/portrayal hasn't changed, see rooftop as an example, Sanji isn't some honorary supernova. Oda's idea in that area are the same as when he gave only Zoro the next bounty in Alabasta; when it comes to making a name in the new world Sanji isn't at the front with Luffy, Law, Zoro, Kidd etc.