Convince me to buy into 4/3

The edge to edge sharpness is dependent on the lens and in the 4/3 format you will find the best edge to edge with the 75mm and 45mm at f5.6.

Given that the lens is the determining factor, you can look at lens comparisons at slrgear.com.  Compare these two lenses against ANY other lens for sharpness.

Once you done that come back to earth and join the rest of us who just enjoy the format in its size, excellent lens offerings and overall enjoyment that it brings in shooting.

Buy an E-M5 and call it a day.  It's a fine camera, just ask me. (and about a bizillion others).

--
Dan