http://www.engadget.com/2014/04/11/samsung-galaxy-s5-review/
Chances are, you'll be happy with the Galaxy S5 if you choose to buy it. It's a solid upgrade to the Galaxy S4, with reasonable improvements to the design, software and camera. I can't say this is your most visually appealing option, especially compared to the all-metal HTC One M8, but the dimpled back and waterproof casing at least add more durability than we've enjoyed on previous Galaxy S devices.
The fingerprint scanner and the heart rate monitor, on the other hand, need some work. Each delivers inconsistent results and can be quite frustrating to use. The good news is that you don't have to use them if you have the same experience that I did; the bad news is: If you don't take advantage of these features, you have fewer reasons to buy the phone in the first place. What's more, Samsung put a lot of energy into integrating these features into both the GS5's hardware and software, which makes me wonder what the company could have included instead if it left those out. If you're looking for a good Android phone, the GS5 won't let you down. I'd be happy using this as my daily driver. That said, I wouldn't waste an early upgrade on it, either.
Edgar Alvarez produced the video review.
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Samsung
Galaxy S5
PROS
Fantastic display
Daylight images are on par with other flagship phones
Waterproof casing and improved design
Good battery life
CONS
Fingerprint scanner can be frustrating
Selective focus doesn't always work as promised
Heart rate monitor isn't completely accurate
TouchWiz UI looks better, but is still confusing
CONCLUSION
The S5 is a solid upgrade over last year's model, with improvements to the hardware, software and camera. However, certain headline features like the fingerprint scanner and heart rate monitor are mediocre at best. Chances are, you'll be happy with the phone, but don't fork out the extra cash for an early upgrade.