Fujifilm XP90 has a
16.0MP 1/2.3 (6.17 x 4.55 mm ) sized BSI-CMOS sensor . On the other hand, Canon SD3500 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 XP90 and SD3500 IS sensor size comparison.
Fujifilm XP90 and Canon SD3500 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. On the other hand, since Canon SD3500 IS has 14% larger pixel area (2.01µm2 vs 1.76µm2) compared to Fujifilm XP90, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.