Sony A100 has a
10.0MP APS-C (23.6 x 15.8 mm ) sized CCD sensor . On the other hand, Fujifilm X100T has a
16.0MP APS-C (23.6 x 15.8 mm ) sized CMOS X-TRANS II sensor and features EXR Processor II processor.
Fujifilm X100T's sensor provides 6MP more than Sony A100's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the A100 and X100T sensor size comparison.
Sony A100 and Fujifilm X100T 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 Sony A100 has 59% larger pixel area compared to Fujifilm X100T, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.