A:Answer4K is the amount of pixels stored in the video for higher quality. Its like the TV's, the more amount of detail that is stored means the CMOS or capturing portion of the camera needs to have the ability to see and save it. However according to canon's website I see the RP is listed to also have 4K.
A:AnswerIf you’re going to be doing mostly video, you will want to get a high capacity battery for sure. The stock battery won’t get you much more than an hour.