Thanks for the link to the samples. The raw DNG files can be read with a simple program using libraw. The raw values seem to be linear. No need to faff with white balance or demosaicing, of course.
With B&W cameras, there is no opportunity in post to edit tones according to their colours, so we need to do it in pre, eg with yellow, orange or red filters to darken skies. Other editing (cropping, global and local tone-shifts, sharpening, etc) work in the usual way.
The images [EDIT: in the second group of “Sample Raw Images”] suffer from poor focus or camera shake or both, so it is difficult to judge the lens quality. Perhaps the photographer couldn’t get the hang of the rangefinder. The photos don’t do justice to the camera. (Or maybe the camera is crap, of course, but I doubt it.)
It reminds me that some photographers have B&W “eye”, the ability to spot an arrangement of scene tones (instead of colours) that will make an effective photo.
EDIT: The first group of “Sample Raw Images” does not suffer from poor focus or camera shake, so are a better guide to lens quality, which looks great. But history shows that these files have been processed by “Adobe Photoshop Camera Raw 12.2”, so they are not really raw images. Grrr.