Shallow depth of field is achieved by three factors: the size of the image sensor, the focal length of the lens, and the widest (or fastest) aperture of the lens.
That being the case, we would be looking at full frame lenses with the longest focal length and fastest aperture. Depending on the use case, this could include the Canon EF 50mm f/1.2, the Canon EF 85mm f/1.2, the Canon EF 300mm f/2.8 and the Canon EF 600mm f/4.