I installed the sear from the Valor (0.0840" sear legs) in my Kimber that has an Ed Brown hammer and sear (0.0915" sear legs) and the trigger had a very small amount of movement with the hammer at half cock i.e. with Ed Brown hammer and Valor sear. However, the trigger wouldn't reset when released following the test described by CAWalter ....
"when the trigger is held back and the slide forced back just enough for the hammer to engage the half cock and release the slide back to battery" the trigger must re-set when released."
I used a small file and some emery paper to reduce the thickness of the EB sear legs (where they contact the disconnector) to 0.0800" and now the trigger has a little movement at half cock AND it passes the reset test!! This Kimber is my USPSA match gun so I'll shoot a few matches to see if it holds up without any problems and then consider doing the same thing to both of my Ed Browns and another Kimber.
This thread has really helped my understanding of the 1911 trigger group. I can follow the logic behind having a tiny amount of play in the trigger at half cock. If there's play, then the sear is fully engaged in the half cock notch. If there isn't any play, the sear may be 20%, 30% .... 90%, 100% engaged but there isn't any way to know for sure. Sufficient pre-travel and the resulting play in the trigger at half cock removes all doubt. I like it!! If it helps to reduce the chance of trigger bounce and/or hammer follow then I like it even more.
Thanks to the OP for starting the thread and to 1911Tuner and CAWalter for sharing their knowledge.