Hoping someone here with a GH4 could comment on how useable video AF is for casual videos of people. Does DFD keep up pretty well? I found some youtube tests where it performed reasonably well against some competitors but it's hard to tell from such limited and controlled tests. GH4: https://www.youtube.com/watch?v=59ggE-fG46k GH4 vs 70D: https://www.youtube.com/watch?v=HDEIHDSj8gs (starting at 8:38) NX1 vs GH4: https://www.youtube.com/watch?v=0DigAgYD-QY Does GH4 identify and track subjects pretty well in a dynamic people scene (like kids milling about)? Can it handle kids moving around quickly and in and out of the frame? Does it guess who the subject might be reasonably well when there are lots of possible moving or stationary subjects? Does it get confused, or does it stick to something? Does it focus hunt to the point of being distracting, or does it manage to make a reasonable guess as to whom the subject is and stick to them? Are there any 1.4 or 1.8 reasonably wide lenses that are silent and optimized for video? Or would I have to use a 2.8 zoom? And does the GH4's ability to AF at -4 EV also apply to video? Thx for any answers.