Like the iPhone, to activate the Samsung Galaxy S5's camera, you can swipe up from the corner of the lock screen, and use the volume button to take a shot. Again, because of the positioning of this button, it's relatively easy to obscure the lens with your finger when holding the phone horizontally.
There's a few more icons and choices to get your head round with the S5, with a mode button being available on the right hand side of the screen to allow you to choose from auto, panorama and so on. You'll likely stick with auto for 99% of your shots.
In the top right you'll see a cog that you can press to bring up some different options, such as turning picture stabilisation on, effects, metering modes and more. You can leave everything to auto, or take a little more control over things yourself if you prefer.
The S5 is very quick to focus, and even in low light it does a good job of locking onto a target acceptably quickly. You'll see a circle appear and turn into a green outline when AF is acquired.
Although on occasions, the S5 struggles a little with cyan colours in skies, generally colours are nice and vivid. For macro, the camera coped pretty well, allowing you to get quite close to the subject without too much trouble.
In low light, the S5 copes very well, producing images which appear smudge free and well detailed at reasonable sizes - if you're only ever going to be sharing on social media sites, you should be more than well served by the S5.
The front facing camera doesn't perform quite so well, but again if you're only sharing at small sizes, this shouldn't be too much of an issue.
The digital zoom is half decent, if a little smudgy if you look at an image under any kind of close scrutiny, but if the light is good and you really do want to get closer to the subject, it's not a bad shout.