I'm still somewhere in the middle of Chapter 5. I just couldn't stomach the boredom, and the knowledge that there's two more chapters of that is not helping motivate me to finish.
Chapter 6 is where things starts to get truly interesting. Chapter 5 is just a way for you to wonder, "What the hell happened?"
The only things of note that happen in Chapter 6 are the Chest Key finally dropping at the very beginning and the Conjurer Job fight at the very end. Chapter 7 is where the fights are actually changed up and the game drops the "Didn't we fight these chucklefucks before?" narrative for character based idiosyncrasy ("You have no Girl Power. We must fight."), and Chapter 8 is all about Supra-charged Team Fights that are more like post game fights like Omega Weapon/Shinryu were in FFV.