Thanks for the replies. I think I'll probably go for a used Zeiss. I have the 85mm 1.4 and it is built like a tank. From a reputable dealer, I suspect that a used lens will work quite well for my purposes. I shot video with a Zeiss 50mm 1.4 on a 5D Mk III recently and fell in love with the lens. I had been satisfied (not exactly happy) with the Canon 50mm 1.4. But there is just something about the Zeiss that feels good and looks good. I have the Canon 24mm 1.4L II that is beautiful for photos, but I don't love it for video. I hope I haven't just developed a Zeiss fetish.
I think comparing the Zeiss 50mm f/1.4 to the 50L is a more fair comparison than with the EF 50 1.4. It does have a beautiful quality to it, the bokeh looks very unique and the color rendition is very accurate, and it's super sharp at f/2 and above. If you like that you should try the 50mm f/2, it's insanely sharp. The 21mm f/2.8 is awesome if you don't like the 24 1.4 for video, although it doesn't have as wide of an aperture, the 25mm f/2 may be worth looking into as well, haven't used it but I've heard nothing but good things.