Panasonic ZR1 has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor and features Venus Engine V processor. On the other hand, 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.
Below you can see the ZR1 and SX150 IS sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic ZR1 and Canon SX150 IS Cameras
Panasonic ZR1 and Canon SX150 IS 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
Panasonic ZR1
or the
Canon SX150 IS ,
including hyperfocal distance.