Dual SD card slots, compared to a single slot in the α7R II. However, the slots do not exactly match. One is an SD slot (UHS-I/II compliant), the other is a dual SD (UHS-I compliant) and Sony Memory Stick Duo slot.
Improved shutter mechanism to reduce shutter-induced shake
Pixel shift multi-shot mode that combines exposures taken on each subpixel of the Bayer filter, improving overall image quality