[keepright]

No, you won't see a difference in your photos based on the brand that you choose. There really are no "bad" cameras on the market, and within the same price bracket all brands perform similarly.

As far as brands go, Olympus is no more of an "off brand" than Pentax (Hoya) or Minolta (Sony); compared to Nikon or Canon all three have much lower market penetration, lower retail and rental availability of lenses and accessories, and significant advantages over the two main brands that outweigh those limitations for many of us.