I was in Japan last week and I had the chance to go to BIC Camera and Yodobashi and try out various lenses on display with my A7R2. I tried Sony lenses, both E and FE, and Canon EF lenses with a Kipon electronic adapter. (The Sigma 35mm you see is what I had for the trip) Lens information is in the metadata.
https://www.flickr.com …/albums/72157660563602133
And, yes, they had a 600 f4 II, 500 f4 II and 400 f2.8 II for you to get your grubby hands on.
With all Canon mount lenses, the A7R2 did not enjoy focusing from a blur. It needed some help in order to lock on focus.
I have to agree. No perfect solution. Too bad they haven't put the 600mm DO out yet.












