Eh, I think I'll forgo the 21/4 and end up with a 28/2, 35/1.4, or 35/1.2. How much wider (field of view, I guess) is 28mm compared to 35mm? (f/4 just seems too slow for me...I like to use ISO 50 film and slower.)
What other cameras offer auto-exposure, and at least 28mm frame lines? I guess there is the Zeiss Ikon, but that is just one pricey camera.