The biggest my printer can do is A3+ (33x48cm, 13x19"). Not anywhere near
my limit for neither the K-1, the K-3, nor the K-5.
The extra cropability of the K-1 is welcome, though, even if I probably won't print bigger.
Edit: Come to think of it, the biggest one of my images has been printed was on some banner ads, and that was from the 16MP Ricoh GR. Don't know what size, but the agent sent me this image of the banners. And before anyone mistakes me for a pro; I have sold exactly
one image in my life!