Looking at the photos in the linked article, it appears to me that the backgrounds were blurred in PhotoShop. I've owned every version of the Canon 70-200mm f2.8L zoom, and none of them could render a background that looks like those examples. If you look closely, you can see a strange dark "halo" around the main subject in each image where it was masked off so the rest of the image could be selectively blurred.
If that's the case, you could certainly achieve the same effect with the Fuji 50-140mm f2.8.
And don't forget, there is no difference in depth of field between the Fuji lens and the Canon lens if you use them at the same aperture, focal length, and subject distance.