Both Olympus TG-5 and Fujifilm X30 have 12.0 MP resolution sensors but Olympus TG-5's sensor is 1/2.3 (6.17 x 4.55 mm ) and Fujifilm X30's sensor is 2/3" (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 Olympus TG-5.
Below you can see the TG-5 and X30 sensor size comparison.
As seen above, Fujifilm X30 has a 2.1x Larger sensor area than Olympus TG-5. 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.