I use an SA 9mm 1911 for steel challenge with rear target sight and front FO sight. Sight picture is sometimes referred to as #2 with POI at the top edge of the front blade. I recently bought an H&K P2000 for HD/CC with 3-dot sights set up the sight picture #3 (POI behind front sight dot). Our practice range has us shooting from the shade into a bright background and there is little question that the H&K sights are faster to align than my 1911 sights - the top edge of the rear target sight is not that distinct in the shade.
Now most matches are shot in the open so rear sight visibility isn't quite the same issue, but I'm serious thinking of a Dawson FO rear target sight assuming I'll have enough adjustment to get the POI under the front fiber. I know some folks shoot action pistol with sight picture #3. Any feedback out there on applying this to steel challenge and particularly regards using fiber optics versus the much larger white dots?
I suppose I could go all the way to fixed white dot sights, but that's a bigger step and would probably require at least one iteration of front sight height.