All is not equal but you really need to see what the late Bob Carlos Clarke could do with a Black & White original. Toners and Chromogenic developers/couplers and retouching dyes. Much help from Agfa & Tetanal. His exhibition and book Dark Summer are the best example as a reference point.

But the use of chromogenic techniques & dye couplers is relevant here as that's the basis of all but Ilfo(Ciba)chrome. Ron's taken the Ciba (Ilford) route of Dye destruction, this had potential that was never fully realised, it could have yielded films the equal of or far better than Kodachrome. But the companies were complacent and didn't follow through.