The Rolex Datejust II and Rolex Day-Date II were both released in the last few years. At first, you might not think about comparing these two watches. But they are both the same size and look almost the same.
Their predecessors were 36mm wide and for a long time that was considered sufficient for men, but the last decade people have continuously preferred bigger watches. So it was just a matter of time till Rolex would make a bigger version of the popular Datejust and Day-Date.