Ektar is capable of at least as much detail as any slide film. Maybe more. I print it using the finest neg carriers and apo lenses; and when its printed onto Fuji Supergloss, which is comparable to Cibachrome in its ability to hold detail, this characteristic is evident. But sharpness is also subjective and dependent upon both subject matter, specific hues, and contrast. Sometimes when I make dupe chromes or contact internegs the published specs and grain structure becomes quite important. It can also make a difference when working with very small neg like 35mm which are "wanabees" for otherwise outsized prints. But overall, there are a lot more important things to think about than just numerical resolution when choosing a film. I think the whole subject is a bit overblown.