I checked my SA trigger pulls on my 2 CZs and my 1 Tristar with my trigger pull scale. I got some different reading, but my gauge is a cheapy and it's not always consistent. I was getting some 3.75 lbs. reading on my SP-01, but not consistently. I guess you get what you pay for. All my guns are 100% stock. Here are my results.
CZ P-09......... 3.25 lbs.
CZ SP-01....... 4 lbs.
Tristar T-120....4.25 lbs.
Here is a picture of my trigger pull scale and 2 pictures of how I was set up to test my pistols.