Nikon L28 has a
20.0MP 1/2.3-inch (6.16 x 4.62 mm ) sized CCD sensor . On the other hand, Nikon S6500 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor .
Below you can see the L28 and S6500 sensor size comparison.
Nikon L28 and Nikon S6500 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.