Is an iPhone 6 plus camera good for filming?

I know this is a dumb question since I'm considering buying a phone for a camera, but help me out if you guys can since I don't know my facts too well. I am a film maker, and for awhile I've been using a Samsung WB250F, but started to look back the quality just isn't as great anymore, I just doesn't have as high quality as i hope and looks pretty bad on retina screens. I've been trying to buy a new camera, and recently stumbled on an iPhone 6 Plus, that has a beautiful quality camera, and I do love the 60 frames per second recording, but is that a good idea? I've also been looking at Parasonic Cameras and Nikon Cameras, but I'm just not sure what to spend my money on, and which could offer my needs? Also, I saw an action cam by AEE, that has 4K recording and 60 FPS. Is that a good option too since it has high specs. Only thing that makes me skeptic about it is that it's only $250 which is really cheap and it's a go pro type device. Thank you

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