This might not be a fair comparison. In 1960, Kodachrome was the established process and E-6 was the newcomer. By then the film, chemicals and processing for Kodachrome were perfect. Not so for Ektachrome. I have nothing quite that old, but some of my Ektachromes from the 80's look as good as when they were shot. And of course, my dad's Kodachromes from the 50's still look good.