On my MK III .40, the trigger was gritty and required between 8 and 9.5lbs of pull to 'break' and have the hammer drop. Unacceptable for single action for me.
I changed the trigger, safety, sear, hammer and springs- and did some tuning/tweaking as I set it up. Now it feels very nice, has no overtravel is smooth and lighter than original, [around 5.5-6lbs pull] with crisp break, and no way to get rid of the long reset that I can see.
I spent a few hundred for all of the parts, including stones to dress/fit parts. I am happy with it.
On my 1957 FN 35, made for Austria's Landes gendarmerie kommando [rural police force], the trigger is smoother and lighter, with the same reset- and I didn't touch the internals.
So- the older ones seem to have been better fitted than the newer ones. I never felt a Mark III factory trigger that I liked, but all the ones I felt were from after 1996, and I only tried about a dozen out of all of those produced.
Some are very nice with no changes. Some need a change for me to be content with it.
Once dialed in, they are very very nice. If the reset wasn't so long I would probably prefer them to the 1911.