I know this has probably been discussed, but I was unable to find it in a search. According to the Olympus lens page, the MTF curves for the two lenses look pretty similar; yes, the 1.8 does get the edge, especially for 60 LPMM, and I think these tests are at full aperture for each lens, so the 1.8 would be even better 1-2 stops down. But I'd be interested in anybody's opinion who has owned both at the same time, as to what is each lens' best. The 2.8 is small, cheap, and ratings are pretty good. I don't want to fork out the money for the 1.8 since it is reportedly "good, but not great." Would I be wasting my money getting a used 2.8? Maybe I'm just cheap, but a pancake and the E-M5 would be a handy grab-n-go kit.