After repeated unexpected failures to get proper focus with the A7 and the FE 16-35mm on it, I did a number of experiments to find out its possible cause. I normally use the A7 in AF-S mode with the small flexible spot and I ended up with way too many pictures that just were misfocussed, usually the image was sharp before the intended focus point. Experiment 1 Compare between MF and AF-S, wide-open at f/4, subject with near and far. Using AF-S actual focus ends up before the intended focus which was at the far end. MF was dead-on. Experiment 2 Flat subject (bookshelf), lens wide-open at f/4, compare between AF-S and MF with all sizes of flexible spot => No discernible difference, all OK. Experiment 3 Near and far subject matter, i.e. bookshelf under 45° in horizontal direction. Lens at f/8, Live view setttings effect OFF => Front focus. Lens at f/8, Live view setttings effect ON => Perfect. Why this last experiment? If I remember correctly PDAF is supposedly disabled as soon as the aperture is closed beyond f/6.3 and that is effectively what happens when you set Live view settings to ON and set the shooting aperture at f/8. I suspect that when the camera does not respect the focus area of the flexible spot when it uses PDAF. If this is true, I again curse Sony for not providing the option to disable PDAF! I'd like to hear other ideas and opinions on this.