Are some of the app openings a little false on the second lap of the iPhone? Is the user sure the app is ready?
Doesn't iOS store a image screenshot of the last thing that the app was displaying when it's closed. Then when you next open it, that saved image is the first thing that's loaded and displayed, then the app loads in the background behind the image and only then becomes ready.
On the second lap you can see the games becoming ready in this manner (initial static image, then movement) but some of the other apps are just loaded to the point the initial screenshot is shown, then immediately closed without any proof the app is fully ready. (Such as a scroll up and down)
Also, the resolution will always have an affect for every action on the phone. Every time that display moves, the note 7 has to push a whole lot more pixels. it all adds up.
That's not to say the iPhone is poor, it's clearly not, but I think it's made out to be a bit faster than it may actually be for getting the apps fully ready.