Both Pentax E85 and Fujifilm X30 have 12.0 MP resolution sensors but Pentax E85's sensor is 1/2.3-inch (6.17 x 4.55 mm ) and Fujifilm X30's sensor is 2/3-inch (8.8 x 6.6 mm ).
Since Fujifilm X30's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Pentax E85.
Below you can see the E85 and X30 sensor size comparison.
As seen above, Fujifilm X30 has a 2.1x Larger sensor area than Pentax E85. 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.