Gee guys. Didn't mean to get folks' dander up.
Most of my SIG's are SA. Half are German made; half are USA made. Only being a shooter, I miss all the little things you talk about. I haven't measured any of my guns' trigger pull, just go by feel. I've cranked the adjustment on my X-Series as soft as possible without an accidental discharge. I just pull the trigger until I feel resistance, then I increase pressure until it fires; then release it and repeat.
The ones with the lightest trigger pull are the X-5, X-6 and the CZ75 Tactical Sport. Most of the rest have triggers that my arthritic fingers manage without a problem. Probably the best trigger in all my guns is the one in my Ruger 10-22; it's a factory trigger group with a Brimstone Tier 3 make over. I know it's a rifle, but that trigger is marvelous. Doesn't seem to have any travel, very light pull, Brimstone said 2 1/2 pounds, and I can't feel any travel before reset. I must admit I'm ham handed, but I love that little trigger group.
I really like the SDP and plan to run it against a DW Guardian 9mm and a SIG p239 9mm next week. I feel those guns are similair, but the SDP is the tightest of any guns I own, or I have fired.