Picked up the Samsung Galaxy S5 last week whilst waiting on my 128GB iPhone 6 Plus to arrive, and I fucking love the SD card slot. I can cycle cards as I want, the camera is very nice, and I can swap the battery out, in effect the S5 is the only phone made for the real world in non-ideal conditions. The S5 is a phone we can take anywhere on the planet and extract significant utility from in any condition and that is fantastic. A lot of hiking trails etc. simply do not have any connectivity and completely disregarding other design trade offs, that entails that devices which do not have a SD card slot and are entirely reliant on the "cloud" are simply not made for anything other than city life.
Samsung continues to impress me with their hardware engineering, I just wish they would develop or utilize greater expertise in the context of the operating system, and ideally integrate that with a system well. In the context of engineering, Samsung could make a killer platform for software and hardware development were it to integrate tightly with Linux or Windows 7 in the same way that iOS is very well married to OS X; the software side is the only drawback here, with more improvements on the OS side of things, Samsung could own all the markets, which would be awesome.
I'll see how the camera compares to the 6+'s in the real world whenever it arrives, I think they should be close as it is quite nice already. I see more and more women using Samsung devices, previously it was ubiquitously iOS devices, so that is very interesting.