Like some wrote above: Me too, I am not too excited about how wide 28mm is, and lived with my 24/2.8 for years using colour slidefilm (Nikon F3T camera most often).
Also used it a lot with short extension rings, for a wide-angle macro approach.
On DSLR, the lens is markedly colour-fringing and weak in the corners .. and my small 20/3.5 does better in that respect!
AND: Enjoy your new lens, escuta!