Panasonic LX3 has a
10.0MP 1/1.63-inch (8.07 x 5.56 mm ) sized CCD sensor . On the other hand, Nikon L19 has a
8.0MP 1/2.5-inch (5.744 x 4.308 mm ) sized CCD sensor .
Below you can see the LX3 and L19 sensor size comparison.
As seen above, Panasonic LX3 has a 1.8x Larger sensor area than Nikon L19. 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.