580EXII worked well in manual mode. Obviously doesn't work in ETTL mode, but I generally use manual mode most of the time anyway.
If only they had the Sony sensor in a 1d body at the A7R price.
Not familiar with Sony's latest hot shoe, but so the 580EX II will physically fit inside Sony shot shoe and get a fire signal when Sony's shutter is released? (in manual mode)
In short Yes. The hot shoe is a little shorter so the back two pins do not make contact. I understand that Nikon and many other flashes that support M flash mode will also work. I have yet to see a Sony flash that does not need an adapter to work with it. I refuse to buy a Sony flash because I do not want some flimsy adapter between the camera and the flash. So I use my 430EX II on it instead.
6D, 60D, Rebel XS, EF-S 15-85, EF 70-200f4L, EF 100f2.8L, Tamron 70-300VC, Tamron 28-75f2.8, Tamron 150-600, EF 40f2.8, EF 50f1.8, EF 85f1.8, EF 24mmf2.8IS EOS M 22f2, 18-55, EOS M-EF adapter, Nex6, SEL50f18, SEL1018, DN 30f2.8, adpaters and Fd and M42 lens.