Well let's see. I tried several Pens when they first came out. Some of the NEX and lastly the EM-5. Always some quirk I didn't like that keep me from using them much. The biggest problem was high ISO noise for what I was using it for or erogonomics, Good for you John as you benefit from the reviews.....
I ran across a deal on a used Xpro 1 and after trading some gear around here I am again. The EM-5 was close but just to small for me to work with.
Xpro 1 by Cosmonaut's, on Flickr