And yes, Samsung phones dominate the Android space. Personally, I find their version of Android to be bloated. So many features nobody really needs and so many more that are really only valuable if you have Samsung throughout your A/V system and home.
I call it SAMDroid as opposed to Android - like I said earlier, they do fine HW, leveraging on the ideas of others perhaps...
The Samsung GS4 was their last/best/good device... remains to be seen if their iPhone6 clone does well, so far, it's kind of like the GS5 as a performer - they get some decent units sold at a discount price - watch the ad for a BOGO when the carriers decide to clear inventory on a share plan...
Right now I can get a GS5 for $0.99 trade in on a pre-paid plan... if that ain't channel stuffing and blowing out inventory, I don't know what is...
(Samsung, I'll concede, does do some things right - their 3-D V-NAND stuff in SSD space is pretty impressive, and there, they're well ahead of others -
too bad they can't write firmware for their SSD's that don't unexpectedly cause data loss when using TRIM commands..., oh well, I've got two of their SSD's in my collection of Macs, good performers, but now I don't trust them).
BTW - if you want a really good Android device, and don't want to pay the premium for Nexus - look at the 2014/2015 Moto releases - close to the Google experience with not so much crapware)