Currently own an Xperia Z1 but other devices in our house are owned by family members: 5s and mini retina. None have complained to me of any problems, but they're also not even remotely into tech as a hobby like I am so if there were any commonly complained about but not very noticeable issues it's very likely they wouldn't catch them or be as picky as I am about it. Which is why I'm asking here
FWIW I myself have noticed through my own digging that Apple's rate of persistent nagging issues is exceptionally low and easy to get support and remedy. I really enjoy Sony's quality as well though as well as the features I love most about Android. But.... iOS has been creeping up in cool new stuff lately just enough to tempt me away.
For example I really don't find using android as-is all that interesting. But I'm absolutely tickled about using Android with the new wave of "smart" launchers coming out now like this one called Aviate:
Android Launcher Review - Business Insider
But the problem is that enjoyment rests on the fragile base that Aviate will always be as good as it is now. Lose a good experience like that and I'm stuck right back to boring old vanilla stock or plain holo theme launchers like Nova. As it stands right now, given the choice between using Android stock and iOS I like iOS a little more.
The secondary dilemma I'm faced with is that the only way I'll get any bugs patched immediately is to buy a Nexus. But between the Nexus 5 and the Xperia Z2 there's just no contest. Therefore all it takes is for one crummy patch to slip through and I'm waiting months for it to get fixed.
Sorry for the long post, just trying to clarify the motives behind my curiosity