FYI:
Just noticed that DxO Optics Pro has recently added support for some more Sigma lenses, including my 10-20 4-5.6 (yay!).
Now the currently supported Sigma lenses include:
Sigma 8-16mm F4.5-5.6 DC HSM
Sigma 10-20mm F3.5 EX DC HSM
Sigma 10-20mm F4-5.6 EX DC HSM
Sigma 17-50mm F2.8 EX DC OS HSM
Sigma 18-125mm F3.8-5.6 DC OS HSM
Sigma 18-200mm F3.5-6.3 II DC OS HSM
Sigma 24-70mm F2.8 IF EX DG HSM
Sigma 30mm F1.4 EX DC HSM
Sigma 50mm F1.4 EX DG HSM
Sigma 50-200mm F4-5.6 DC OS HSM
Sigma 55-200mm f/4.5-5.6 DC
Sigma APO 70-200mm F2.8 EX DG OS HSM
Sigma 120-400mm F4.5-5.6 DG APO OS HSM
Support for 3 or 4 additional Sigma lenses is due in a few more months.
DxO Supported equipment