Samsung Galaxy Camera 4G has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features 1.4GHz Quad-Core processor. On the other hand, Samsung NX30 has a
20.0MP APS-C (23.5 x 15.7 mm ) sized CMOS sensor and features DRIMeIV processor.
Below you can see the Galaxy Camera 4G and NX30 sensor size comparison.
As seen above, Samsung NX30 has a 13.1x Larger sensor area than Samsung Galaxy Camera 4G. 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.