And if you want to go a bit longer, the Nokton 1.5 is a fun lens. As some have said, there are a few Zeiss ZM lenses that are those focal ranges, give it a whirl to save up. Until then, most everything now is state of the art, and you're going to have a blast with the Skopar; I have the 28mm and it works quite nice. (And, if you're parting out that Mam7 and have a spare 65mm... )