I had some time on my hands and a new RCBS trigger pull scale so I did some testing:
Ruger SP101 .32 H&R with a spring kit and some smoothing by me: 2.5 lbs
S&W 27-2: 2.9 lbs
S&W 745: 4 lbs.
S&W 52-2: 1.5 lbs
S&W 629-6: 4 lbs
Ruger Super Blackhawk Hunter with Power Custom trigger and hammer: 1.25 lbs (too light, I'm going to put in a heavier spring)
Freedom Arms 83: 4 lbs.
It's interesting how perception can influence your opinion. I would have thought the 745 was much heavier and the 27-2 was lighter. I guess it's because the 27-2 has a real "glass break" feel and the 745 is not quite as clean.
It also may be due to the position of the scale on the trigger vs where you place your finger.
The 52-2 is still the best of all.