Leica M Typ 262 has a
24.0MP Full frame (35.8 x 23.9 mm ) sized CMOS sensor and features Maestro processor. On the other hand, Canon 1Ds MIII has a
21.0MP Full frame (36 x 24 mm ) sized CMOS sensor .
Below you can see the M Typ 262 and 1Ds MIII sensor size comparison.
Sensor Size and Resolution Comparison image of Leica M Typ 262 and Canon 1Ds MIII Cameras
Leica M Typ 262 and Canon 1Ds MIII have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Leica M Typ 262
or the
Canon 1Ds MIII ,
including hyperfocal distance.