I've been busy with my calculator (well excel to be exact)
Making some simple assumptions -
BMW master Cylinder 25mm diameter
Ford master Cylinder 22.2mm diameter
Ford Caliper Piston 54mm diameter
If you assume that a force of 100lbs (45kg although that is not strictly a force before anyone says anything!) is applied to the master cylinder, then for each combo the force at the pad would be in the region of -
BMW MC 466lbs
Ford MC 591lbs
So basically with the BMW master cylinder you are only seeing about 78% of the pad clamping force you would with the ford unit.
Hope that is some help.
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