Max Shutter speed
Olympus E-M1 can shoot continuously at max speed of 10 fps
and has max shutter speed of 1/8000 sec
Unfortunately E-M1 doesn't have a built-in flash but it has a flash shoe for mounting external flashes.
Olympus E-M1 features both Contrast Detection and Phase Detection autofocus (AF) systems which ensures speed and accuracy of focusing in most situations. The AF system has 81 points to choose from.
Olympus E-M1 also features Face detection AF
where it intelligently detects the faces in the frame and locks the focus automatically.
Macro shooters will love Olympus E-M1's Focus Stacking feature. In this mode, E-M1 automatically composites multiple shots taken at different focal positions using focus bracketing to create a single image with maximum depth of field.