I think this thread has gone in way too many directions to actually make sense out of it. Diopters, old manual lenses, circle of confusion, hyperfocus, auto/manual focus, post process sharpening, with/without glasses, iPhone apps, macro-photography, ancient film lenses and on and on - many of which don't really apply or are contradictory.
To get a sharp image, simpilify everything as much as you can and get a good image. Then change ONE thing at a time. Are you satisfied with any of your images? Is it just the landscapes your are having trouble with?
TF