Does the Bayer Filter on an Image Sensor Make a Photo Less Sharp?

In some circles of photography, film is really the only option on attaining maximum sharpness from a lens--and those circles may attribute the problem to a Bayer Filter. I mean look at it this way: the Leica Monochrom offers such incredibly sharp photos because of the lack of a Bayer filter. So that has to be the case, right? Well, not really.