Sony HX9V has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features BIONZ processor. On the other hand, Sony HX10V has a
18.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features BIONZ processor.
Below you can see the HX9V and HX10V sensor size comparison.
Sony HX9V and Sony HX10V have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture.