What I've liked about what's currently happening, is that Oda has positioned Luffy, Zoro, and Sanji, for big time power ups.
I think after the Awakening, that Luffy will finally be powerful enough to be Kaido 1v1 of they we're both a full health.
Zoro, I think this Grim Reaper thing will lead to a big power up for him. From this point forward, he might be on Mihawk's level. That fight has to be coming pretty soon.
And Sanji, with his bodies evolution, it's tough to say what specifically his strength would be? But I think at least around someone like Kizaru, probably any Admiral.
But we are getting near the end game. I think the next bounties will be the 2nd to last bounties. I can see Luffy's being over 4 Billion, Zoro and Sanji definitely over a Billion.