Hi,
I would agree on the issue being a single instance report. Obviously it can happen, under certain conditions. In many cases it helps to flip out the LCD for better cooling.
But, as Michael points out, the A7rII is not intended to be used as a video camera. Video is just a bonus option. Now, I would say it is a real bonus. I often present my images as slide shows, which today often means video showing stills. Adding motion enhances the slide show.
So, I would say the video capability is a real bonus and the A7rII does that better than most full frame DSLRs.
But, if the main focus is motion, a motion camera may be the better option.
And just to say, for the f/8 and be there stuff, nothing beats an iPhone except perhaps an Android based phone :-)
Best regards
Erik
This is a single instance report.
Yes, it is known that the A7RII can overheat, particularly in warm conditions and when shooting long continuous takes.
I have been shooting 4K video with an A7rII since the camera was announced and have never had overheating. Another one instance report.
I'd simply add that these cameras are for occasional use shooting video, not for filming long single take events such as a football game or a concert.
In any event, for serious filming applications something like the new Sony FS5 would be a better choice.
Michael