16 Differences Between The Sony a7C and a7III

Form Factor – slightly narrower than the a7III and shorter thanks to the EVF moving which is also great for smaller gimbals
Weight – about 140g lighter than the a7III
Control layout – more ergonomic with fewer buttons better laid out
Mode Dial – improved with 3 custom memory modes and movie mode is moved
EVF – Same resolution, but smaller magnification on the a7C
Flip screen – a7C screen can be used as a selfy screen
Video Recording Limits – a7C has not limit to recording time
Video Eye Tracking AF – tracks eyes in Video on the a7C, but the a7III can not
Eye-tracking AF when monitoring via HDMI – a7C doesn’t lose the ability to track eyes when recoding externally
Tweaked color science – a7C has better color science so no more magenta shadows
Post Stabilization with Gyro Metadata – a7C records gyro data for post stabilization
Shutter – sounds and feels different, cant disable electronic first curtain shutter on a7C, Max shutter speed of a7C is 1/4000 vs 1/8000 on the a7III
NTSC/PAL switching – don’t need to reformat cards to switch
Card Slot – a7C only has one card slot and it’s on the left
Port Covers – on the a7C there are doors covering ports instead of flaps
Price – a7C is $200 less than a7III, but you can find used a7III and deals on the a7III

The Sony a7C is an upgrade over the a7III. One more thing the a7C is a clicky shutter and the a7III is a squishy type.

Sony a7C: B&H Photo / Amazon / Moment / Adorama
Sony a7III: B&H Photo / Amazon / Adorama