The E-5 isn't meant to appeal to the mass-market, and we suspect that it won't. However, as a flagship for the established Four Thirds system it succeeds brilliantly. The E-5 is capable of excellent results, and its tank-like body should take years of abuse. Unfortunately, comparably poor image quality at high ISO settings, and restricted dynamic range make it less competitive than it could be.
Low ISO, bright light shooting, and working in tough conditions
Anything where speed, dynamic range or high ISO image quality are critical