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When you think of "crop" you also need to consider in terms of what format. In other words, when thinking of a crop with a MFDB, we're thinking in terms of a 645 sensor---not a 35mm DSLR sized sensor. So even with a "cropped MFDB sensor" it's still a relatively large piece of real estate.
Current generation MFDBs are full-frame Dalsa CCD sensors, used in the P65+, IQ160/180, and IQ260/280. Other backs may have a slight crop, such as P45+ is a 1.1 and P30+ is a 1.3 crop on a 645 sized sensor or format. It is helpful to consider format "crop" when considering your camera platform and lenses (field of view).