Below you can see the front view size comparison of Nikon D750 and Sony A99 II. Sony A99 II is 9mm shorter and 2mm thinner than Nikon D750 but it is also 2mm wider.
Nikon D750 vs Sony A99 II - Front View
Nikon D750 vs Sony A99 II - Top View
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.
Camera Size Comparison
Select Two Cameras for Size Comparison