Canon SX720 HS has a 20.3MP 1/2.3" (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features DIGIC 6 processor. On the other hand, Olympus TG-4 has a 16.0MP (1/2. ) sized BSI-CMOS sensor and features TruePic VII processor.
Canon SX720 HS's sensor provides 4.3MP more than Olympus TG-4's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the SX720 HS and TG-4 sensor size comparison.
As seen above, Canon SX720 HS has a 0.0x Larger sensor area than Olympus TG-4. 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.