I was thinking about this thread on my way home. I remember seeing that Galen Rowell photo of the rainbow over a Tibetan Palace and the print was quite big. Likewise, the Don McCullin photo of the soldier throwing a grenade, some Steve McCurry portraits, and some huge Salgado prints shown outdoors in Lisbon. I think all of them came from 35mm film and were printed as wide as my shoulders. Timing, light and composition seemed to be what made them special, I didn't put my nose next to the prints to check for grain.