Apple doesn't make their own components nor assemble them. Foxconn does all of that. Samsung actually manufactures their own stuff, so your claims of "fully integrate" aren't quite all that. This is apparent as there are issues with the Iph6s battery shortchanging users on battery life."match the experience of iphone?" really?
smartphones are very competitive these days. it takes both hardware and software to fully integrate and work together to utilize battery efficiently in limited space. Samsung does not design OS and has no control over it. They rely heavily on Android and Google. How can samsung phone runs as efficient as iphone when Samsung has no software experience or control? Google and samsung are two separate companies, and cooperation between them is not as good as if they are the same company.
two things that most android phone owners complain: battery and laggy, no matter what cpu and RAM android phones have.
I've heard plenty of iPhone users have issues with their phones. Solution? Restart the phone.
Samsung's lineup is most definitely a match for iPhones (if not more). And that's even if you leave out the Note 7.