Leitz EFERN

Leitz code EFERN ELMAR 135/4.5 telephoto lens without range finder coupling and 1931 production of 2394 in total was some outstanding model in their oldest productions.
Now I've arranged it with production No. 037 to adopt on Canon Digital EOS body checking the imaging in the finder actually. Although non-coating lenses as it was designed, it commands a different view from recent computerized designed ones. I can perceive something on the transparency that cannot be obtained through by multi-coated glasses. In another words, however thinner the coating materials might be, something important should be cut off to produce the reality on the imaging element.
I have ever read about Leitz lens designing concept in some Leica Lens manual, "KANTE Theory", that is how clearly the edge could be cut existing 3 dimensional objects on 2 dimensional surface. I can see a piece of their concept even 80 years ago. This is why I stick to old Leitz designed lenses. From a different standing point of view, Digital imaging body could compare to a lens test device?