Conclusion from Brian Smith:
Unlike previous a7-series cameras that each have particular strengths or features, the flagship a7RII does everything well. Unless you need to shoot in near darkness where Sony A7S still has a slight edge at extreme ISOs, the a7RII would be my choice for everything I shoot.
Brian Smith also said that Sony a7RII has the fastest AF system:
Currently, Sony a6000 has the fastest AF system of Sony mirrorless cameras, but a7RII will be faster.
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