Sony NEX-5 has a
14.0MP APS-C (23.4 x 15.6 mm ) sized CMOS sensor and features Bionz processor. On the other hand, Ricoh GXR GR Lens A12 28mm has a
12.0MP APS-C (23.6 x 15.7 mm ) sized CMOS sensor and features GR Engine III processor.
Below you can see the NEX-5 and GXR GR Lens A12 28mm F2.5 sensor size comparison.
Sensor Size and Resolution Comparison image of Sony NEX-5 and Ricoh GXR GR Lens A12 28mm Cameras
Sony NEX-5 and Ricoh GXR GR Lens A12 28mm 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.
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Sony NEX-5
or the
Ricoh GXR GR Lens A12 28mm ,
including hyperfocal distance.