This looks really interesting:
In the α7R III on the new pixel conversion multiple shooting mode, make full use of the fuselage 5-axis anti-shake function, to achieve high-resolution images. In this mode, the camera moves in 1 pixel increments and shoots four separate pixel moving images, containing a total of about 99.44 million pixel data. The four images can be synthesized and processed using the software from the new Imaging Edge Intelligent Imaging Application Center. This mode allows for higher resolution and color accuracy of still images, which will be more ideal for shooting themes with complex details and colors for architecture, artwork, or other still life.
Aka pixel shift.
Some existing cameras can do this, , but otherwise cool feature
The 24-105 looks to be a full inch shorter than the 24-70gm, moderate size, about the same as 24-105L, with no adapter needed.