compact size just a touch smaller and lighter than the E-M5 II:
16mp Live-MOS sensor which gives high image quality even at ISO 1600
81 pt CDAF
TruePic VII image processing
very nice built-in 2.36M EVF
touch screen is tiltable but not swivel/rotating
LCD has 'Adaptive Brightness' viewfinder technology (same as in the E-M1)
ergonomic customisable controls
shutter speed 60sec - 1/16,000th sec
new AF targeting pad
60p 1080 HD video not just 30p
flash sync 1/250th sec
new 4K time lapse video mode
electronic shutter mode
Live BULB
multi-exposure mode
ART filters
one of the most comprehensive in-camera Raw re-processing systems
very fast AF for slow moving subjects but no phase detect AF for C-AF tracking of faster moving subjects
unique eye detect AF
manual focus assistance
automatic magnified view when rotate a system lens manual focus ring in MF mode
magnified view zoom x5/x7/x10/x14
image stabiliser can be turned on during magnified zoom via half-press shutter
focus peaking
similar menu system and user interface controls including my favourite: the Live Super Control Panel although to enable it, it is still buried deep in the menu system
auto HDR with JPEG output
mode dial function with possibility of assigning Mysets into mode dial
option for automatic lens IS priority for when using lenses with OIS
option for shorter release lag-time
multi function settings with color creator (as in the E-M1)
option for level in EVF when pressing shutter button half way
Live Composite Mode - allows visual gradual build up of image with multiple exposures as is used in astrophotography - this is similar to Live BULB mode but multiple exposures rather than just one long exposure
adds a cut-down version of the '2×2' control system which is used to great effect on the E-M1
intervalometer:
WiFi smartphone remote control