check out this video around the 1:15 mark. he claims the note 3 doesn't have an IR sensor in the front.
That would be because that guy has no idea what he's talking about. The Galaxy Note 3 manual clearly labels a Gestures sensor on the front face of the device, same as the S4. All of the gestures that guy mentioned in the video work on the Note 3. The holes on the top of the Note 3, in order from left to right, are: Light AND Proximity sensor, Gestures sensor, front facing camera. Again, like I mentioned before, the light and proximity sensors on the Note 3 share the same hole. On the S4 they do not. That is why the S4 has one more hole than the Note 3.
http://support.t-mobile.com/servlet.../SM-N900T_UM_English_PS_MI7_092413_F4_Web.pdf
There's a link to the manual of the T-Mobile version of the Note 3 (the one I have). On page 22 (as labeled on the page) it details the locations of all the sensors, including the Gestures sensor. On pages 47-48 it details all the motions and gestures (you know, the gestures that guy said wouldn't work on the Note 3 but they do).
So, would you rather believe some random guy in a youtube video, or the official Samsung manual?