Well, looking at the Pikachu cards I still need, the main difference is that he has all Korean cards, while I’m still missing 8 right now; he has 4 more Spanish cards than me; 3 more Italian cards; 1 more German card; and 1 more French card. In terms of misprints we’re about equal most likely, but he has a lot more autographed Pikachus, which is where the difference is mainly coming from when I mentioned 30-50. But it’s mainly those Korean, Spanish, and Italian cards tbh. He’s better at making contacts around the world I guess (and he also primarily collects Pikachus, while I collect too much at once sometimes haha. So it’s easier for him to focus time/money on chasing certain Pikachu cards).
Anyway, we both have some cards the other one need, but he has slightly more Pikachu cards in total all combined (if I exclude my extended/altered Base Pikachus 
).
Greetz,
Quuador