I don't think there are many differences between versions. I guess it's more important if the glass is clean, coated/not coated and if the lens is in a good shape.
Every comparison shots I've seen also suggested that RedScale versions don't equal better performance over other coated Elmars... maybe that "myth" comes from the fact that RedScale Elmars are the newest of the whole 3.5 Elmar line and therefore often in a better shape.
I don't think there are many differences between versions. I guess it's more important if the glass is clean, coated/not coated and if the lens is in a good shape.
Every comparison shots I've seen also suggested that RedScale versions don't equal better performance over other coated Elmars... maybe that "myth" comes from the fact that RedScale Elmars are the newest of the whole 3.5 Elmar line and therefore often in a better shape.
From what I understand there's also the M-Mount Elmar 3.5, coated, which would be the same optical formula as the red scale, but with newer coatings.