Nikon D2Hs has a
4.0MP APS-C (23.7 x 15.5 mm ) sized JFET sensor . On the other hand, Nikon D3200 has a
24.0MP APS-C (23.2 x 15.4 mm ) sized CMOS sensor and features Expeed 3 processor.
Nikon D3200's sensor provides 20MP more than Nikon D2Hs's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the D2Hs and D3200 sensor size comparison.
Nikon D2Hs and Nikon D3200 have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.