That's great timings. It goes upto 5 hours, but mostly its ~4 hours SOT.
Yeah, it's camera is good, except for very low lights, but it has just very basic camera controls, even in the so called pro mode. So not very suitable for someone looking specifically for photography.
In used, you can get a lot of good phones if you are good at buying used phones. S5 is a great option if you can find a good one. G3 & Z1 are good, but not great.
Used phones market prices are so low these days, that they buy old scratched broken body phones and then put new casing on it with new seals and screws and sell as fresh (slightly used) imported stock.
I myself dialed #12580369# and saw RF CAL (manufacturing date). 10/10 scratchless S5 having manufacturing date of early 2014 with thousand charger connect count are being sold as fresh (slightly used) stock.