I did something I've never done and that is lose my iPhone 5. I'm pretty sure it is on my property somewhere but since I live "off the cell tower grid" I can't locate it. So I went to BestBuy and they had one gold iPhone 6 128GB left. I bought it on AT&T's Next plan and the phone has been great! It is truly AMAZING! The video, slo mo and otherwise, is so worth the upgrade. While videoing and walking or turning the iPhone 6 smooths out the video. In low light, such as a sunset, the video is less "noisy". Slow motion, although at 720p is crisp and astonishing. Don't even think about it if you use your iPhone for video and photos. Go get one!
EDIT: case in point - this is a frame of unedited video created by the iPhone 6.