Sigma fp L has a 61.0MP Full frame (36 x 24 mm ) sized BSI-CMOS sensor . On the other hand, Sigma Quattro H has a 45.0MP APS-H (26.6 x 17.9 mm ) sized CMOS (Foveon X3) sensor and features Dual TRUE III processor.
Sigma fp L's sensor provides 16MP more than Sigma Quattro H'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 fp L and Quattro H sensor size comparison.
![Sigma fp L vs Sigma Quattro H Sensor Size Comparison]()
Sensor Size and Resolution Comparison image of Sigma fp L and Sigma Quattro H Cameras
As seen above, Sigma fp L has a 1.8x Larger sensor area than Sigma Quattro H. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.