Sony RX1 has a 24.0MP Full frame (35.8 x 23.8 mm ) sized CMOS sensor . On the other hand, Panasonic ZS100 has a 20.0MP 1" (13.2 x 8.8 mm ) sized MOS sensor and features Venus Engine processor.
Below you can see the RX1 and ZS100 sensor size comparison.
As seen above, Sony RX1 has a 7.3x Larger sensor area than Panasonic ZS100. 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.