Fujifilm X-A2 has a
16.0MP APS-C (23.6 x 15.6 mm ) sized CMOS sensor and features EXR Processor II processor. On the other hand, Nikon D90 has a
12.0MP APS-C (23.6 x 15.8 mm ) sized CMOS sensor .
Below you can see the X-A2 and D90 sensor size comparison.
Sensor Size and Resolution Comparison image of Fujifilm X-A2 and Nikon D90 Cameras
Fujifilm X-A2 and Nikon D90 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
Fujifilm X-A2
or the
Nikon D90 ,
including hyperfocal distance.