Kodachrome has been said to be a difficult emulsion to scan well; something to do with the red channel. But if you want to see how good the quality of traditional scan reproduction is, you need only go back 20 to 40 years reading Time and National Geographic where thousands upon thousands of Kodachrome slides were shot around the world and scanned so beautifully as to hold everybody in a bewitched state. I know that's how I felt in the 70s and 80s, long before the faux purity and sharpness of digital landed.
I have attempted to scan some of my Kodachrome slides from the 1980s but cannot get the hues right. I don't have this difficulty with Fuji/E6 slides.