Dial side: With some common elements of style. The Patek has its two sub dials located under the 3 and 9 o clock line, while the Montblanc is well centered. Some will like, others won't.
Movements: Cal CH 29-525 for the Patek, Cal 16.29 for the Montblanc Villeret Minerva, which is almost 10 mm bigger than the Patek. But with a smaller power reserve ( Circa 55 hours for the Montblanc, 65 hours for the Patek ).
As for the finishings, the Montblanc wins, clearly.