I have found with my A7r2 that the built in exposure metering consistently suggests settings that actually give a overexposed look despite showing as neutral exposure on the display EV scale.
I got used to that when shooting raw and always exposed raw at that suggested level, which allowed head room for recovery while allowing the black to show detail with out grain at higher iso settings.
However when shooting video that built in overexposure does cause a issue when using non log profiles, in that the over exposure does not take kindly to recovery.
Using a log profile however does seem to like the overexposure suggested by the metering with the exposure being reasonably gradeable.
Using a remote monitor with false colours and adjusting the exposure to obtain what the false colours show as a correct exposure results in the camera display showing one stop underexposed.
So , for me , shooting video with non log profiles I use one stop under and , for log profiles and for raw stills , one stop over works for me regardless of the ambient lighting available.