I'd just shoot the tests myself. Without keeping lighting, metering, scenes, developing (in B&W), scanners, post processing, etc. consistent, it can be hard to tell the differences in some of these films. Get a couple rolls and setup a test scene and do some side-by-side tests yourself.
Ektar is a good example for me. It does have finer grain and more saturation than a lot of other C41 films. But to my eye, if the grain isn't an issue, it's not *that* different than something like Portra 160VC in terms of color. The lighting and scanning have WAY more impact in my experience than the choice between those two films. Not that there aren't differences between them. I just find it somewhat odd that someone would absolutely rave about Ektar (which they do) and not care for Portra VC. I think they'd be surprised if they did some side-by-side tests.