When I look at my (15) lenses I actually miss a really small and sharp pancake lens for FE / E-Mount. I am dreamng of a FF lens with 24 mm focal length. In FF it would be already a real wide angle lens, in APS-C a useful 36mm lens! The light intensity should be limited in favor of length and weight to f 4.0 or even f 5.6.
An image stabilizer would also be dispensable in favor of size and weight.
If such a lens would then still have a ZEISS-label, I'd be happy. The existing Sony Lens E 2,8 / 20 mm I have tried. I am not convinced about the results, on APS-C cameras the focal length of 30 mm is unfortunatly and is not useful on FF. What do you think?