A couple of years back, I had the chance to try out the Jolla Phone running SailfishOS and even do some app development for it.
Recently, and without the device at hand, I thought about updating the code, as SailfishOS has already gone 2.0 - and since I'm a proud owner of a Galaxy Samsung S4 smartphone, I went about looking for any available ROMs I could try out...
... but in the end found myself producing builds for the device, and things progressed quite well, so with big thanks to everyone else before me like JustSueMe, Simon Van der Veldt, and the porters at #sailfishos-porters@irc.freenode.net, below are several links to resources, such as ROM builds to try out, porting status and active discussion on the subject!
So if you have one of these Samsung S4 GT-I9505 LTE, a.k.a. "jfltexx" and would like to try out something different, your feedback will be very appreciated:
Mer Wiki Device Page
XDA Porting Thread
SailfishOS ROM Download
Youtube Video Gallery