I have a lot of Canon equipment, incl. 1Dx, 5D3 and all major lenses. Got pissed with the video quality and got a A7s, then also the Atomos Shogun for 4K. I got my A7R ii yesterday and tested a little bit, both video and still. Did not do a take for 30min (yet), but it worked nicely. The big benefit for A7R ii is the combination of stills and 4k video in a small package, especially for traveling. For such use, you will normally film for max a few minutes pr. clip. Now, I see a lot of complaining about the overheat issue. If the filming of "a few minutes clips" is a problem, then is bad, yes. However, the point is that pr definition, if you film constantly for > 30 min, you need to use a recorder (it will stop at 30min anyway), with or without a monitor. I do not see this as a big drawback as for such jobs, you will stay in one location.