Sony H300 has a 20.0MP 1/2.3" (6.17 x 4.55 mm ) sized CCD sensor and features Bionz(R) processor. On the other hand, Sony RX1 has a 24.0MP Full frame (35.8 x 23.8 mm ) sized CMOS sensor .
Below you can see the H300 and RX1 sensor size comparison.
As seen above, Sony RX1 has a 30.4x Larger sensor area than Sony H300. 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.