Below you can see the front view size comparison of Sony A99 II and Nikon D1X. Sony A99 II is clearly the smaller of the two cameras. Its body is 14mm narrower, 49mm shorter and 9mm thinner than Nikon D1X.
Sony A99 II vs Nikon D1X - Front View
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.
Camera Size Comparison
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