I have two young boys I've owned the galaxy s5, HTC one M8, and I currently have the G3 and iPhone 5s. I can honestly tell you the the galaxy s5 is the slowest phone I have ever seen to focus in anything but perfect lighting, ie in your living room trying to snap a photo of the kids. Terrible, just terrible.
The HTC is awesomely fast and takes good low light pictures, but outdoor photos lacked detail, so much so that I had to return it. But with only 4mp to work with, I get it. Still not a bad camera, just not enough detail.
Then there's the G3 which is my current daily driver. I have to say I love this phone. Its much faster than the s5 to focus, but it still has trouble with moving objects. The iPhone 5s still takes consistently better (low light) photos than any of these phones.
Long story short, if you're bored to death with iOS, like I am and you have young kids you're trying to capture in random moments. The G3 is probably your best android option at this point.
There are many other things that I like about the G3 over the other mentioned android phones. But I'm just talking cameras here.
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