Later in the same trip to Tokyo, mentioned previously, I switched the 17mm to the EPM2. The little EPM has a tough run. It was gifted, but not used much. It was sold, but came back. It now sits around as the spare to the spare to the spare.
On the Tokyo trip last year I decided to do one of the no-no's of street shooting. I took two cameras with different interface, different batteries even and two I was not overly familiar with (the two Pen's).
The Pen F continued to frustrate as the on/off switch magically got turned off regularly (by magic me it seems). The EPM on the other hand started to quickly feel very comfortable. The left hand hold I favour actually allowed me to turn on and off, focus and shoot, all with my thumb. The thing worked like a dream.
I also feel the EPM is a slightly more mature sensor and processor than the EM5 mk1. Not much, but occasionally the images have more punch without excessive contrast.