Nikon D2X has a 12.0MP APS-C (23.7 x 15.7 mm ) sized CMOS sensor . On the other hand, Canon 1D MII has a 8.0MP APS-H (28.7 x 19.1 mm ) sized CMOS sensor .
Below you can see the D2X and 1D MII sensor size comparison.
As seen above, Canon 1D MII has a 1.5x Larger sensor area than Nikon D2X. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.