I use these cameras interchangeably and while the Olympus has a slight edge (very slight edge) on out of camera color, I favor the GH2 for form factor - much more comfortable in my hands and I like the fully articulating lcd which can be stored lcd against body to protect it - I feel that GH2 acquires and locks focus more quickly than the E-PL5. High ISO noise is slightly more apparent on the GH2, but Nik DFine takes care of that when necessary.

Yesterday, I had to shoot some pictures in a fluorescent lit building and relied on just Auto White Balance, and in general, the color was quite good, as evidence by these shots, which also show fleeting moments of expression that I might have missed with the e-pl5 because of the slower focus.

I used mostly the Panasonic 20mm f/1.7 and there is one shot, I believe, for which I used the Olympus 45mm f/1.8.