Max Shutter speed
Olympus E-M5 II can shoot continuously at max speed of
10.0 fps and has max shutter speed of
1/8000 sec. E-M5 Mark II also has an electronic shutter which can shoot silently at max speed of
1/16000s. One thing to keep in mind is that electronic shutter may cause rolling shutter / jello effects, and also banding issues under artificial light on your images.
Flash
Unfortunately E-M5 Mark II doesn't have a built-in flash but it has a flash shoe for mounting external flashes and Olympus also includes a small external flash with the E-M5 Mark II that you can mount on when you need.
Focusing
Olympus E-M5 II features a Contrast Detection autofocusing system. The AF system has 81 points to choose from. Olympus E-M5 II also features
Face detection AF where it intelligently detects the faces in the frame and locks the focus automatically.
Focus Stacking
Macro shooters will love Olympus E-M5 II's Focus Stacking feature. In this mode, E-M5 Mark II automatically composites multiple shots taken at different focal positions using focus bracketing to create a single image with maximum depth of field.