I've learned that if I stay still, but my kids are moving, the shot usually turns out good. Not every shot mind you, but 8 out of 10 if I had to guess. Here is a good example. This one I was still while taking the picture but my son was swinging a golf club:
[url]https://farm8.staticflickr.com/7725/17209324752_1075bf37a0_c.jpg[/url]
Galaxy S6 action shot - golf swing by
Jim B L, on Flickr
Now on the flip side, if I'm moving and they're moving, the shot can come out fairly blurry. I'm learning this and compensating accordingly. My guess is this might be true of most smartphones, including the iPhone? Obviously I can't say for sure, but you have the iPhone so you know. Here is an example of one of my kids riding a tricycle while I was walking and trying to take a picture. This was in the evening with the sun down behind trees, so better lighting might have helped?
[url]https://farm8.staticflickr.com/7664/17209328412_67dda9d793_c.jpg[/url]
Galaxy S6 action shot - riding bike by
Jim B L, on Flickr
Now I have a small sample size to work with, I've only had the phone a little over a week. Overall I'm extremely happy with the camera, but at the same time I'm trying to be unbiased and give you honest real world answers. My mom has the iPhone 6, and I've always been envious of the pictures it takes. Now I am not, and from what I've seen, my photos are as good or better now. I've seen some fairly blurry ones from her phone too, and my guess is it's the same thing I've experienced, if I'm not keeping the phone fairly still then chances are good you're going to get some blurring.