I'm sorry, I HAVE to chime in here because everyone's (up to the posts I've read) is acting like this gentleman's experience is normal behavior for the Note 4 - which they are NOT....the problems "logik brooklyn" is experiencing are not 'normal'. I have a Note 4 and have over 450 programs installed on it (a RANT for another day) and it doesn't lag at all. When it DID lag, I have ALWAYS found that it was a CA (crap app) that I'd installed, and removing it, removed my lag. Regarding the camera, I've never seen ANY camera perform as well as this thing IN LOW LIGHT, YES! Go to your camera settings, turn off your flash, turn on hdr, then go into a dark area without any iphobe's nearby (as to spare their iarrogance when their icrap is "exposed").
When they ask why your Note 4 suddenly takes such beautiful low-light photos, tell them you must have been holding it wrong.