Canon 5DS has a 51.0MP Full frame (36 x 24 mm ) sized CMOS sensor and features Dual DIGIC 6 processor. On the other hand, Zeiss ZX1 has a 37.0MP Full frame (36 x 24 mm ) sized CMOS sensor . Canon 5DS's sensor provides 14MP more than Zeiss ZX1'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 5DS and ZX1 sensor size comparison.
Canon 5DS and Zeiss ZX1 have sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Zeiss ZX1 has 34% larger pixel area (23.11µm2 vs 17.17µm2) compared to Canon 5DS, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.