Nikon P7100 has a 10.0MP 1/1.7" (7.44 x 5.58 mm ) sized CCD sensor and features Expeed C2 processor. On the other hand, Panasonic LS5 has a 14.0MP 1/2.33" (6.08 x 4.56 mm ) sized CCD sensor .
Below you can see the P7100 and LS5 sensor size comparison.
As seen above, Nikon P7100 has a 1.5x Larger sensor area than Panasonic LS5. 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.