I recently popped a contrast-increase mask on a 6x7 Ektar neg and enlarged it to 20x24 for testing purposes. That's nothing I plan to do routinely because the overall results are still quite inferior to the
what I get with larger sheet film. But it was a real eye-opener in terms of grain, and the now apparent
fact that the limiting factor with Ektar is going to be lens resolution and plane of focus, not grain magnification or film resolution per se. And yes, all other things being equal, it is distinctly sharper than any Ektachrome film at a comparable level of print contrast.