This will be my next camera purchase, and although my favourite street camera is the RX1, the A7s will be fantastic for low light indoor photography. Its 400,00ISO figure is a little mystical, and no doubt impractical for most situations, yet at 56k or so it seems to do very well in these Milky way shots. I'm very keen to see how it performs at prime focus on some more usual objects in a direct comparison to the Canons. Like any new system, it will take some sorting out to obtain best results for any new application, but the goods look very promising.
How about real-time video of the milky way for composition and focus at ISO 409k?
http://youtu.be/mctD-hu4s9U
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