I agree a tlr like a Rolleiflex may provide a better result. As you are using the camera at a position not disimilar to a tlr it is not the perspective in height but the abiluty to include more of the surroundings in the environment. Surroundings can be very important in placing and telling the story. A little more in the image might help in saying this is on a subway vs a bus, etc. An alternative is a wider lens on the Nikon.