Highlight metering on the Nikon D750 preserves detail in the highlights at the expense of the shadows. Essentially, it's matrix metering with priority for the highlights and a weighting factor for how much of the scene is in highlight. In bright scenes, it will give you a contrasty look with dark shadows. These photos were taken with highlight metering, and were mostly take wide open at f/1.4.
Gear Photos were made with a Nikon D750 and a Tamron SP 35 mm f/1.4 Di USD.