No way, my iPhone 5S was noticeably slower after I got iOS 8.3 (damn Apple Music). So much so that I upgraded to a 6S Plus.I'm still on my iPhone 5S, which is pushing three years old. It runs fine (iOS 9.3.1 is just as quick as the original OS it shipped with), but it needs a fresh battery.
But I suppose it's a matter of usage and expectations. I hate lag anywhere since I use the phone so much.
Likewise, watchOS 2 really slowed down the AW. Feels like I'm using an iPad 2 (no, not iPad Air 2, but the 2nd gen iPad from 2011) with iOS 9. Horribly slow. But I suppose this is the price of going with a first gen product. Oh well.
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