Ended up grabbing an A7 + Kit lens on Sunday (I would still love to have the A7s). So far I'm very impressed. I'm coming from the Fuji X-Pro1/X-E1 camp, and although I loved my X-Pro +35 combo so much I sold it and kept the X-E1.
I'm still trying to decide on if I should keep the Sony (14 day return policy), so far I only got to shoot around my place, haven't taken it outside because I want to put a filter on the lens before I go out.
I love love love the peaking feature on the A7 when compared to the X-Pro/X-E1. Because I can make the picture profile to b&w, and change the peaking to red + High and WOW! What I would really like to do is to try my vintage lenses with this camera to see how quick the peaking is.
I feel that the focusing speed of the 28-70 locks on just as quickly as the X-E1+ Kit in good light. I normally use the centre focusing point because I'm used to having it on the 5DII. The real test however will be when I get the chance to shoot an event or people to see how it holds up during normal and low light conditions.
The EVF refresh rate is very slow on the X-Pro1/X-E1 which hampered my enjoyment of using manual focus and low light conditions. The native fuji lens with auto-focusing were just fine enough to do weddings.