Just got an LG G2 from AT&T for free. This is the best Android phone I've tried by far. Great battery life, great camera (OIS and 1080/60fps videos), excellent performance absolutely no hiccup or stutter anywhere. Love all the LG add ons that are in quite useful. IMO stock Android is overrated and boring compared to this, actually the LG skin is more customizable than stock - custom sort your app drawer, or how about changing the front touch buttons? I added a button to slide down the notification drawer instead of having to grab and slide from the top of the screen. Having a sharp, bright, and big 5.2" screen in a smallish chassis is icing on the cake.
I played with the Samsung S5 next to the G2. While both are plastic, the LG feels much more solid and is more pleasant to hold than the Samsung. And I'm surprised this isn't a big complaint, all the Samsung display phones with AMOLED had serious screen burn in. It's a shame though Samsung will still sell like ten S5 for ever one G2 LG sells.
Also handled a dummy HTC One M8. The build quality feels every bit as nice as my iPhone 5s. I probably wouldn't have been able to resist had HTC improved the camera just even a tiny bit. I'm not a megapixel junkie, but that 4MP sensor on the One is 16:9, so you really only have a 2MP camera once you crop out the sides. I had the M7 last year. Daytime photo quality is absolutely horrible.
Still, for now, the iPhone 5s is still my daily driver.