Canon SX150 IS has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Digic 4 processor. On the other hand, Canon SX20 IS has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Digic 4 processor.
Below you can see the SX150 IS and SX20 IS sensor size comparison.
Sensor Size and Resolution Comparison image of Canon SX150 IS and Canon SX20 IS Cameras
Canon SX150 IS and Canon SX20 IS 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.
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
Canon SX150 IS
or the
Canon SX20 IS ,
including hyperfocal distance.