Nikon DL24-500 has a 21.0MP 1" (13.2 x 8.8 mm ) sized BSI-CMOS sensor and features Expeed 6A processor. On the other hand, Olympus PEN-F has a 20.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features TruePic VII processor.
Below you can see the DL24-500 and PEN-F sensor size comparison.
As seen above, Olympus PEN-F has a 1.9x Larger sensor area than Nikon DL24-500. 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.