I have to admit I have a prejudice for 3:2 versus 4:3. But on the E-M1 the EVF styles 1 & 2 have extra features over the E-M5. For example once you get focus there is a horizontal level that shows up also. Very handy. Style 3 is the one to use the full EVF. Styles 1 & 2 don't work well for 4:3 since you use a lot to blank areas. I'd be curious to know what others are using. Right now, 3:2 format and style 2 gives me the best EVF view.