The game is restricted to Japan only, so no forays into Korea (for now, at least). I've played EU3, EU: Rome, Sengoku, and Crusader Kings-- I'd have to say this game feels most like a blend of EU3 and Crusader Kings. There's a strong focus on warfare and conquest along with managing your vassals and family. The overall scope is pretty limited for a Paradox game but there's still a lot of nuance and replayability to be found. If you're looking for the same complexity as the two games you mentioned then you may find Sengoku somewhat lacking. On the other hand, the struggle to progress your character from the lowest rung within a clan to the heights of becoming Shogun by any means necessary can be quite challenging and fun.