Both Ricoh WG-6 and Canon SX710 HS have 20.0 MP resolution sensors but Ricoh WG-6's sensor is (1/2. ) and Canon SX710 HS's sensor is 1/2.3' (6.17 x 4.55 mm ).
Since Canon SX710 HS's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Ricoh WG-6.
Below you can see the WG-6 and SX710 HS sensor size comparison.
As seen above, Canon SX710 HS has a infx Larger sensor area than Ricoh WG-6. 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.