That is interesting to know. I will probably upgrade to the A7RII next year and I wonder to what extent I will still want my A7S when that happens. I find myself reaching for the A7S more often than the A7R. I do agree about the banding issues on the A7S, very disappointing and has let me down at least once quite seriously, although only in artificial light.
I think my point is that individuals can spend too much time worrying about specs and agreed that digital cameras all have their foibles, some are better at some things than others, but it is better to make a choice and enjoy it rather than spend too much time worrying about if you have the best out there.
LouisB