In the below two videos, Tony Northrup compares the low-light capabilties of the Sony a7S against the Nikon D810 and Sony A7 II. He then compares the 4K dynamic range of the a7S against the Samsung NX1 and Panasonic GH4.
As he concludes, the a7S “beat the other cameras by about three full stops, meaning it can film in 1/8th the light and get the same video quality.”
Watch below. (via PetaPixel)