I use the Olympus OM-D EM-1 system for most work these days - the system is so light even with a bagful of lenses and fantastically capable (compared to the Nikon D700 based full frame kit I used to have) and I wouldn't swap it but I now also have an X100V which is a delight when simplicity and ease of use with great quality is what I want - it takes me back to my Leica M6 days! The Pen F has the same potential flexibility as the OM-D but if you only want to use it with a 17mm lens I'd say go with the Fuji instead - nicer to handle and better quality results.
