Well said.
Btw, I have both the nifty fifty and the 50L, and use both, on a 1DX, depending on what's going on. (With the nifty fifty I can laugh it off when a kid happens to touch the lens.)
And I have been thinking about the Rokinon 14mm for a long time, but given that 35mm feels wide to me I don't want to invest in an expensive UWA before I'm sure it'll be of use.