I tried out the SD at a gun shop a few weeks ago, I found that the trigger pull is just as high as the Sigma. The grip is better but it still doesn't justify the $60-90 price increase over the Sigma.
Guess you better get out and handle both yourself.
I have the opposite opinion.
My SD40 trigger is better than any of the Sigmas I've owned.
Better looking pistol with a standard front night sight.
I think it's worth the money.
YMMV
Good Luck