Olympus XZ-2 iHS has a
12.0MP 1/1.7-inch (7.44 x 5.58 mm ) sized CMOS sensor . On the other hand, Leica D-Lux 6 has a
10.0MP 1/1.7-inch (7.44 x 5.58 mm ) sized CMOS sensor and features Venus Engine processor.
Below you can see the XZ-2 iHS and D-Lux 6 sensor size comparison.
Olympus XZ-2 iHS and Leica D-Lux 6 have the same 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 Leica D-Lux 6 has 18% larger pixel area (4.16µm2 vs 3.52µm2) compared to Olympus XZ-2 iHS, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.