At the recent Sony event I attended in Germany Newsshooter compared the a7S II and original a7S cameras side by side in a relatively controlled environment with a model. Both cameras were set in tungsten white balance, S-Log 2, S-Gamut and set to record 4K ProRes HQ externally to an Atomos Ninja Assassin for optimal image quality. The lens was a brand new Canon-fit Zeiss Milvus 50mm mounted on a Metabones MkIV Smart Adapter.
Please note that the a7S was accidentally set at +1 Magenta - which should in theory should have made it less green. Even with this correction it still appears green next to the a7S II.
For the full report please go to newsshooter.com