Sony WX50 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features BIONZ processor. On the other hand, Samsung HZ15W has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor .
Below you can see the WX50 and HZ15W sensor size comparison.
Sensor Size and Resolution Comparison image of Sony WX50 and Samsung HZ15W Cameras
Sony WX50 and Samsung HZ15W 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
Sony WX50
or the
Samsung HZ15W ,
including hyperfocal distance.