A Black-and-white-only camera is not only interesting because of the purity and abstractness of the medium, but also because it has no color filter. This means that each pixel gets at least three times as much light as when a color filter is fitted (as it is in virtually all cameras). Imagine what this does for low-light power.
As as the camera does not have little filters in three different colors, this means that it does not have to guess what the light would be in pixel position x if the filter there had been green and not red. How much exactly this improves sharpness and tone accuracy, I don't know if anybody has tried to measure, but my guess is a doubling or so.
So I don't doubt this photographer when he says that the quality he is getting from this B/W full-frame camera with top lenses is "like from a field camera". (A field camera has a negative of 4x5 inches or even 8x10 inches. Not many of the general public are familiar with photographs of such technical quality.)
Of course like all high-end equipment, it does have lacks which laymen don't understand: it does not have Image Stabilization (anti-shake), and it does not have autofocus! A different beast.
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