I have printed a few pictures from my X-M1 and X-T1 at 24" x 36", completely satisfactory.
The first few were jpegs right out of the camera, 72 dpi. One printer told me he thought I might be "pushing it a bit" but really they were completely satisfactory at a viewing distance of less than 12 inches.
Since I now shoot raw+jpeg, I processed the next few files from raw to jpg at 300 dpi. That same printer now tells me the largest he can print them is 4' x 6' - because his printer can't do larger, though the files are good enough.
I fondly remember my 2nd paid gig, food, with an 8 mp camera. The "art director" expressed grave doubt as to whether the resolution could meet his standard - "Can't you please use film?" In those days of dial-up modems I uploaded 100 highly compressed rough proof images (about 500kb each) with promise to give him edited high-resolution files when he made his selection. Heard nothing for a month, so I followed up. "What? No, those were terrific, thank you!!!!"