Like Matt says.
I used to own an RZ and the 50mm ULD, the 110mm, and the 180mm. The 110 was my favorite.
The first time I shot it I took some group family portraits of my wife, our daughter, her son and daughter-in-law, and new granddaughter. These were waist and up seated group shots with different ones holding the baby so no one individual was that large in the photos. My wife complained that you could see every pore and wrinkle in her skin.