The Sony A7Siii is a full frame mirrorless camera that allows greater video recording capability than any of the previous models.
It can capture UHD 4K video at 4:2:2 10 bit internally at up to 120fps or up to 240 fps in Full HD. It also allows you to record 16-bit Raw video externally into a separate recorder.
It has a ISO sensitivity range of 80-102400 which can also expand to 40-409600.
The camera also has improved Autofocus features including eye and animal AF.