The Sony a7 III blends features from the a7R III and the a7S II to make a well-rounded camera that's a huge upgrade from the original a7 and even the a7 II:

• Back-illuminated sensor and image processor have been refined for improved speed and low light performance, with data processing capabilities that are 1.8x higher than its predecessor.
• ISO range has been increased and is expandable from 50-204,800 for stills (and 100-102,400 for video).
• Enjoy approximately 15 stops of dynamic range with exceptionally smooth gradations from shadows to highlights. Color reproduction has also been enhanced, with more natural true-to-life renderings and realistic hues.
• 4D Focus provides stunning AF coverage with 693 phase-detection points covering 93% of the image area, along with 425 densely-positioned contrast-detection points. This is the same AF system found in the a9 and both cameras excel at tracking moving subjects, particularly for difficult depth movements where subjects are coming toward you or moving away from you. 4D Focus also predicts your subject's next move and won't lose tracking even when obstacles enter the frame.
• The a7 III takes tracking to the next level with Eye AF that can now be used in AF-C mode. Enjoy effective eye detection and tracking performance when shooting portraits and candids.
• Like with the flagship a9 and the a7R III, the a7 III has 5-axis image stabilization.
• For videographers, the a7 III is equipped with S-Log3 and Hybrid Log-Gamma picture profiles, which support high dynamic range, help prevent blocked shadows or blown highlights, and create instant, lifelike footage.
• 4K recording is available in the XAVC S format at bitrates as high as 100Mbps and Fast Hybrid AF locks onto and smoothly tracks moving subjects.

For an updated version of this camera, check out the Sony a7 IV.