Just saw the dpreview conclusions for the latest and greatest from Sony FF, the A7Rii:
"Lock-on AF still remains unpredictable and often unreliable"
WOW. My advice is to stick with m43 if AF (in particular, low light AF) is important.
Maybe the A7 third or fourth generation camera will have m43 or dSLR-like AF capabilities (or at least make it close..)
Richard
--
Current cameras: Nikon D750, OM-D E-M5, Panasonic G3, Sony RX100, Panasonic FZ200
Lenses: Oly 12-40 f2.8, Nikon 24-120, Nikon 18-35, Nikon 35mm f1.8 EX, Nikon 50mm f1.8, Panny 25 f1.4, Panny 35-100, Panny 45-150 and Rokinon 7.5 f3.5
Sold: Sony A7ii, Panasonic GF1, Canon S100, Oly XZ-1, Sony HX200V, Canon 60D
Returned: FZ1000