We can honestly admit that we weren't excited blown away by the Galaxy S5. Don't get me wrong, it was a great device but not much other than a few bells + whistles added to it. To my friends looking to upgrade from the GS3, I directed them to the LG G3. The Samsung design language definitely got old quick.
Design/Build
Display
Performance/Battery Life
Keeping it charged is a 1860 mAh battery in its back. While it won't last you as long as other Galaxy or other Android flagships, it will do just fine. On heavy usage, I got about 13 hours w/ moderate use and just over 10 hours w/ heavy usage. Most of the time was used streaming Google Play Music, YouTube, emailing, Hangouts, Foursquare for food, and GPS via Google Maps. This is around a just a few hours shy of what we're used to in regards to Android flagships.
Camera
On the other side, the video camera aspect of the Alpha performs quite well. A lot less complaints when shooting video - whether in HD or 4K. The software-based stabilization works better when recording in 1080p as it doesn't work so well in 4K. It also helps out a lot more when taking photos too. But more so within well-lit situations of course. Definitely a good enough camera but we're at the point where consumers expect more.