These sensors will require a set of new standards on the models'skin quality and the skills of the make-up artists.
They will be a direct hit on the medium-format digital market. Pretty impressive and way beyond my scope.
What aperture do medium format photographers use? One can simply trade aperture, focal length and ISO for sensor size.
The following settings result in exactly the same image when the sensor has the same number of pixels (assuming a perfect sensor and a perfect lens, same exposure time):
crop sensor, 85mm f/1.2 ISO 100
full frame sensor, 136mm f/1.92 ISO 256
medium format sensor, 209mm f/2.95 ISO 606
Now if things are not perfect, smaller sensors have less read noise, therefore ISO 100 on your crop camera will look better than ISO 600 on a medium format camera - but - with medium format you will likely shoot at ISO 100 and therefore collect more light than is currently possible with a crop sensor (until they make one with ISO 16). Currently a win for larger sensors.
Pixel sharpness can be made better on larger pixel sizes - a win for larger sensors.
Lenses can be mades sharper if they are longer and have a narrower aperture. The 85mm f/1.2 is not very sharp but the 200mm f/2.8 is very sharp in comparison at the respective apertures. - BUT - you need heavy and expensive glass to make good lenses for large sensors. This means small sensor: cheap and light glass, heavy sensor: enormously heavy and expensive glass but better image quality.
Also a large sensor could be shot with a big f/1.2 lens and give a blur that is not obtainable with small sensors. - A big win for larger sensors in some areas.
Now with the new Canon sensor and the good Canon lenses you can actually make use of those 50 MPix. If you need to stop the aperture down to avoid too much blur in the out of focus regions your image is actually going to be on par with a medium format camera. The advantage is much lower weight and price than medium format.