My wife is thinking of getting a new camera to replace her EPM-1. The epl-7 or epl-8 the most likely choice. I can not see much differences between the two did i miss something? She is mainly looking for a step up in IQ, faster opting and build in WIFI. How does the IQ of the epl7-epl8 stack up against the em5 -em1? Is it the same or better?