The most obvious stat is luggage space. The Model S has a hatchback configuration which doubles its rear luggage capacity vis-a-vis the competition. Plus, it's got a front trunk, a la Porsches, that has 8.1 cubic feet of space.
The Model S comes with various batteries. The more expensive batteries accelerate faster and have longer ranges. I've chosen two variations of the Tesla along with two engine variations from each of the German marques' mid-sized cars and looked at their prices and 0 to 60 times.