Pentax K-S2 has a 20.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor and features PRIME MII processor. On the other hand, Fujifilm X-T1 IR has a 16.0MP APS-C (23.6 x 15.6 mm ) sized CMOS X-TRANS II sensor and features EXR Processor II processor.
Another similarity between these two cameras is that both Fujifilm X-T1 IR and Pentax K-S2 sensors lack anti-alias (Low-Pass) filters. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moire occurring in certain scenes.
Below you can see the K-S2 and X-T1 IR sensor size comparison.
Pentax K-S2 and Fujifilm X-T1 IR have almost the same sensor size so none of them has any significant advantage over other in providing control over depth of field when used with same focal length and aperture.