New 20-megapixel Live MOS sensor, not the same one Panasonic is using. Optimized for low power consumption, much higher-speed data readout, much better noise performance and dynamic range. Noise performance improved by one stop. 50 megapixel High Res Shot mode can compensate for moving subjects.

TruePic VIII image processor, double quad-core design. One core is dedicated to AF, and the other to image processing.

New high-speed, high-precision autofocus system. 18 fps in full-res raw with continuous autofocus active. (!) 75% vertical and 80% horizontal coverage, all 121 AF points are cross-types. Uses all focus points in every shooting mode, all of the time. Uprated subject tracking can better handle background and subject with similar texture.

60 fps full-res raw burst shooting with autofocus locked from the first frame

50% faster startup time

3x faster internal data writing speed and 2x more raw buffer capacity

New Synchronous Image Stabilization system has a claimed 6.5 EV corrective ability.

Pro Capture function captures up to 14 full-res (and optionally, raw) frames immediately after shutter button is half-pressed, these and final image are saved as soon as shutter button is fully pressed.

120 fps EVF with lag of just six milliseconds. Olympus is suggesting some pros who were shown pre-production units thought it was an optical viewfinder, not an EVF.

Dustproof, splashproof, freezeproof design.

New, higher-capacity battery and significantly faster charging.

New grip works better when shooting with longer lenses.

Dual SD card slots, UHS-II compatibility.