I'll be shooting with the A7S and the 55mm 1.8 in daylight and I was wondering what is the best setting for continous AF. I mean, "center", "wide", etc...
The A7S' continuous AF is very slow to react though. I remember having a heck of a time with your exact setup (same lens) in daylight.
For higher predictability, center focus would be best.
Even if you use [AF/MF Toggle] or half press of the [Shutter] button to immediately drive focus it is going to be slow to react. I find it is slower for closer shots too.
