The tests Tony did were shot with well-lit subjects and most examples people showcase also feature lit or moderately lit scenes. I think where the large photosites really come into play is when you have very very very low light such as a crowd at a concert at nighttime, some wedding venues, documentary shooting at night, etc. Having used the A7s, I have yet to see anything that shoots that clean with that little amount of light. When scaled down , high-megapixel cameras can "combine" pixels which helps to reduce the appearance of noise but if those pixels are really noisy to begin with, they aren't going to combine into something clean. I could be wrong since I don't have the cameras but I'd imagine the next version of the A7s will do better in true low-light compared to the higher resolution A7rII
No-one is complaining about the sensor's size, that is fine, but they should offer the camera with the canon EOS_M mount so we can use PL / C / Leica / Contax G / Canon FD lenses. ( and proper wide angle ) looking at how the mount fits the camera it seems feasible.