First Sanji was going to beat King, then Queen, and now Jack. At this rate he will go down the list and eventually make it to P1.
Sanji beating Jack is hype for him. Beating any of the calamities is hype for him. But it's still not as much hype if he would beat King or Queen. Jack was respectful to both of them when they was belittling him.
It is still not better hype than Zoro beating 2 Yonkos. The manga has already set up for Zoro to be a main player in that battle.