Canon need to put a FF sensor in their old Canonet Rangefinder body... okay that’s 40mm (not sure if all of them were) but closer...Fuji and Sony do 35mm but I've not seen a 50mm one. Fuji have a couple of attachable lens converter thingies that can make the X100 either a 28mm or 50mm but they're not cheap. They do say there's no loss of IQ but you're adding extra glass so not sure how true this is.