Digital BW, The Print

> Almost all the chromogenic are softer (resolving ability)
> than colour print alternatives ...

Portra 400BW is the sharpest of the Portra family of films.  It's a great
combination of high speed, high resolution, and low grain.  That is much
harder to get in conventional B&W films.

> ...and surely colour print conversions cant be considered
> any less B&W than the using a chromogenic!

Color print films contain less information after conversion to B&W than do
straight B&W films (chromogenic or otherwise).