As my new employer provided me iPhone 5s, I can now compare it with Jolla.

Build quality of iPhone is way better than Jolla. Screen is small on iPhone, however, keeping phone in the poket i is way more comfortable. All apps work very well on iPhone. Battery lasts approximately the same as on Jolla.

Jolla UI is better and i had to jailbreak the iPhone to have it also accepting some swipe commands.

However, I am quite impressed with iPhone - UI is not so good, but everything works as it should work email, web browser, calendar sync and etc.