Brake pedal travel can be assessed with the car parked on the ground. One element of free travel is the distance of mechanical easy motion before the master cylinder starts compression. The linkage on the Mark V typically is set up to have about 1-2 cm of mechanical free travel of the pedal before the master cylinder is starting to compress. The next amount of free travel is how far the brake pedal is compressed until solid resistance is felt. On Mark V cars the solid resistance is felt typically in the range of one third to two thirds of full possible pedal travel. My car typically has solid resistance at about half of the brake pedal travel range. If solid resistance is not obtained by three quarters of the pedal travel distance, a brake pedal pressed to the floor may not provide as much braking as needed when stronger braking is warranted.
In my experience, people who are not familiar with the Mark V brakes often comment on how soft the brake pedal feels and how much of the pedal travel range they must use.