I haven't been much a C41 shooter, preferring slides.
I hear that Portra 400 / ProH 400 are popular for that soft look. Re: the 160 versions are they are more normal look? I know the ProS 160 cannot be bought easily but they can be bought in Japan. Medium format size if that matters. I read some find the 400 speed film grainy under 35mm format.
I regularly use Portra 400 for portraits, it is quite good. I don't consider it soft. I use the words accurate or realistic for its rendering. I have not used Portra 160 for portraits, but in architecture work it seems softer to me than Portra 400 and Ektar. I shoot these all of these films in 35mm, 120 and 4x5.
I don't consider Portra 160 or 400 grainy. Portra 800 can be grainy in 35mm and 120 formats.
I regularly use Portra 400 for portraits, it is quite good. I don't consider it soft. I use the words accurate or realistic for its rendering. I have not used Portra 160 for portraits, but in architecture work it seems softer to me than Portra 400 and Ektar. I shoot these all of these films in 35mm, 120 and 4x5.
I don't consider Portra 160 or 400 grainy. Portra 800 can be grainy in 35mm and 120 formats.
The Portra 160 has incredibly small grain. As a result, it renders subtle tonal transitions incredibly smoothly. Smooth tonal transitions can sometimes give the impression of softness when compared with a grainier film, because grain often imparts a sort of artificial sharpness itself.
It is also moderately low in contrast and saturation - certainly less saturated than Ektar. Lower contrast and lower saturation also can give the impression of lower sharpness.
I prefer the way it renders to the way that the higher speed 400 and Ektar render, but that is a subjective preference.
The consensus was that both 400H and P400 act well exposed +1 to 2 stops and go pastel. In a way it can be either used at box speed or act as ISO 100. An anecdotal observation is that P160 turns contrasty when overexposed that way. In any case, I think the scanning stage has a lot to do with it also.
I haven't shot much P160, having a few on the mail on the way to the lab; and 160NS I just have a 220 propack frozen for some future trip.
400 in Medium format looks absolutely fine to my eyes, although peeping in shows a bit of pleasing graininess. In 35mm it is grainier and grittier. Pick up Lomo film (Consumer Kodacolor family) and the 400 in 35mm is quite grainy indeed! Scanning has a lot to do with the airy look and lighting has to be taken into account. Ektar has quite a bit of punch and is more sensitive to light quality in showing more, less or just going weird.