A question for those who have owned both: In practical shooting terms, how much better and faster is the E-M1 over the E-M5? I'm having a hard time getting a handle on the practical differences. I'm most interested in the viewfinder lag, focusing (especially in lower light), and general handling.
Another consideration is standard 4/3 lenses. I still have my original 14-54 f/2.8-3.5, and the original 40-150 f/3.5-4.5. Neither have the later optimization for contrast autofocus. How well would these lenses work on an E-M1?