Coatings correct aberration??
If I recall correctly the composition and structure of the glass in a lens i.e. aspheric/LD/ULD/CaF2 (fluorite) greatly reduces (but can never exliminate) colour aberration: the falling of R/G/B rays at different points; I don't know where coating comes into the formula. I agree the problem with red is more peculiar to the film emulsion than the optic; it never worked for me on Velvia, only Kodachrome 200.