Sony a7R III Firmware Edit
The level and histogram can be displayed on this screen, however not at the same time. It would be great if both could be shown on the screen while composing or shooting video.
The camera has a built-in restriction that limits movie record time to 30 minutes. This can be very disrupting when filming especially if you use three or four cameras. In prior camera there was a hack that allowed the limit to be removed, but there is no such hack for the a7riii.
The Nikon 750 has a really nice feature where you can press and hold a button to get a full screen histogram of the last photo taken. This is a really awesome feature. The press-and-hold approach makes it very quick to check it with only one button press instead of two or more!