6) It doesn't stutter (quite as much)
One of the big disappointments with the S4 was that despite packing a quad-core Snapdragon 600 processor, it stumbled and stuttered far more often than we'd have liked. Not when doing the hard stuff such as playing the latest 3D games, bizarrely, but when performing simple tasks such as moving around home screens and closing galleries. Crazy. Still, the S5, with its Snapdragon 801 chip, doesn't appear to suffer to quite the same extent - it's not flawless, but it trips up far less frequently. Just as importantly, TouchWiz - the Samsung skin which sits over Android 4.4 KitKat - has been stripped back and simplified, making it easier to use. When combined with the bug-free operation, the whole user experience feels far slicker on the S5.
7) It tears through downloads
The S5 has a new feature called Download Booster, and you can probably guess from its name what it does. That's right - it's a social media app for a heavy metal festival. Not really. Download Booster boosts your downloads by using both 4G and Wi-Fi simultaneously where possible. We say 'where possible' because you'll obviously need both a Wi-Fi connection and 4G sim for that to work. But even if you're still stuck on 3G, the fact that the S5 has 802.11ac and 2X2 MIMO wireless tech should speed up your connection.
8) It's roomier
Both the S4 and S5 have expandable memory via microSD card, but where the S4 can only handle a maximum of 64GB, the S5 will take a 128GB card. Alright, so a 128GB microSD card will set you back at least £100 - a 64GB card can be had for about £30. One caveat: Android 4.4 KitKat changed the way that apps work with external storage in order to improve security. The result is that you won't necessarily be able to copy all of your apps on to your microSD card; some will work, some won't. But music, videos, photos etc - they'll all be fine. And if you've got a serious Spotify offline-syncing habit, 64GB won't go far.
READ MORE: HTC One (M8) - six reasons to upgrade
1) But... it's harder to hold
Although the S5's screen is a mere 0.1in larger, the handset itself is noticeably bigger in the hand. If you're small handed - or just don't want to risk ever dropping your phone - you might be better sticking with the S4.
2) It's no night owl
For some reason, Samsung's got rid of the Night Mode from the S5's camera, instead suggesting that you use the Picture Stabilisation mode in low light. That's fine - but the option to turn it on is hidden within a menu, and if you didn't know that's what it was for you'd never guess.
3) It'll cost you
The new Galaxy S5 will set you back £525, SIM-free, and if you're anything like us, you don't have that kind of money lying around. The S4's price will only go down from here - whether on contract or SIM-free - so sticking with last year's tech could be good for your wallet. Us? We'd always choose the 'spend money we don't have on shiny gadget' option, but then we're irresponsible.
READ MORE: Samsung Galaxy S5 review