I've got at least a dozen quality lenses for the Nikons. And I want the 35mm look for what's shot, not the camcorder look. What I want doesn't yet exist, but it gets closer to every generation.
Yeah, the 5300 is a cheap camera (my main body is a Nikon D3s), and DSLR makers are rather slow to compared to other video camera tech. But there's some appealing things to the 5300 -- (1) the video shooting and (2) the lack of low-pass filter for shooting.
If I wanted a truly better camera, I'd grab a Canon or Sony in the $5k to $15k range. But I want to cut some costs corners. Shooting video is mostly hobby. (Just the shooting part,)
I need to look at the Blackmagic cams more -- lens option especially. So-so lens would be a killer for me.