The best replacement for olympus pen is sony nex.

The best alternatives to olympus pen are rated as following:
★★★★★  sony nex
★★★  nikon 1
★★  panasonic lumix
★  pentax q
★  canon eos m
  panasonic gf1
  nikon j1
  gf1
  sony nex 5

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Speaking about olympus pen, one probably shouldn't forget about nikon lenses.

Other search terms related to olympus pen and their ratings are:
★★★★★ nikon lenses
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olympus pen
sony nex
nikon 1