TechRadar - "Powerful, competent and with a whole new UI, it's a shame that Samsung hasn't progressed further with the look of its new challenger."
Powerful, with a fantastic camera and incredible battery life, the Samsung Galaxy S5 is a superb all-round smartphone
Techfrag - According to Consumer Reports, Samsung Galaxy S5 is better rated among fans compared to the latest flagship Galaxy S6. It isn’t often that we see a previous model of smartphone being rated higher than its successor.So why exactly are fans preferring Galaxy S5 over Galaxy S6?
"Getting fast, prompt operating system updates is a good thing, right? Well, not if you’re the unlucky owner of a Samsung Galaxy S5 and you’ve had the misfortune of upgrading to Samsung’s own Android Lollipop 5.0 version for the phone"
it's lighter and probably more hard-wearing (you're much less likely to need a case with the Galaxy S5, for instance) but this is the biggest pain point for Samsung and it's one that it needs to improve with the Galaxy S6.