The same slo-mo video captured with the Note 3 shows noticeably more detail than the allegedly 720p one from the iPhone 5s in the same circumstances, as you can see from the video screenshots inside, indicating Apple might be upconverting from 480p...
Source: http://www.phonearena.com/news/The-iPhone-5s-slow-motion-video-might-not-be-true-720p-experiment-against-the-Note-3-shows_id48419
Source: http://www.phonearena.com/news/The-iPhone-5s-slow-motion-video-might-not-be-true-720p-experiment-against-the-Note-3-shows_id48419