Here's a quick comparison of the resolution between two excellent fixed lens cameras, the Olympus 35 SP, and the Fuji GW690III. Both cameras have the same aspect ration, and about the same coverage and depth of field, that's why this comp will have some value if you want to know the quality you'll need for large print sizes. Of course there are other differences between the two films sizes other than just resolution potential, but this is just a quick write up until I dedicate a post to the subject.
The Olympus 35 SP has a 42mm lens, and uses 135 cartridge film, known by hobbists as "35mm" film, which isn't actually 35mm for the imaging area, but that's for another post. Image area is about 24x36mm
The Fuji GW690III has a 90mm lens and uses 120 roll film, with a size known as 6x9, but it isn't actually 6x9cm, that's also for another post. Image area is about 56x83mm
Both lenses are widely known to be extremely sharp, and have very similar coverage areas; the Fuji would be about 40-41mm converted to 135 format, so it's at a slight disadvantage for this comparison.
To sum up the two images quickly; I'm actually surprised...