Largest Prints from Fuji? Or is Medium Format Film Better?

I don't want to start a debate about what's better, I love my Fuji X-Pro 1 and will upgrade (at some point) to the newer model, but for now I wanted to ask what is the largest print size possible with the X-Pro 1?

I have done some searches on here and other places on the web and there it seems that from the posts I've read, a reasonable limit is around 11x14, perhaps 16x20, is that correct?

The reason I ask, while I love my Fuji, I would like to print bigger, perhaps even up to 30 inches, and for top quality, so I was looking into getting a medium format camera for those specific pictures.

Thanks!