Do you shoot bullseye, revolverguy?
http://www.bullseyepistol.com/joyner.htm
Bullseye shooting relies on perfect sight alignment, not so much on holding on target.
A longer sight radius is more demanding because the eye will have a harder time resolving the small spaces to the side of the front sight within the rear sight notch, as well as the same difficulty detecting differences in the level of each sight in relation to the other, when the sights are farther apart.
This would be attested to by anyone who has participated in International Free Pistol events in which the pistols, in order to maximize accuracy, spread the sights as far as the barrel and sometimes appendages allow. Those guns are the most difficult to use with skill even though their triggers can break at 1 oz or less, their grips can be anatomically fitted to the individual shooter, and they are built with the finest possible barrels and attention to chambering.
Holding the front sight on target with only an approximate placement of that sight within the rear sight would be easier because the front sight is slightly closer to the target, but to shoot bullseye that isn't the task at hand. The target is and should be a vague blur over which the perfectly aligned sights move, sometimes a significant amount, while the shot is squeezed or pulled to breaking with the sights always in perfect alignment from aim, to fire, to follow through.
Bullseye shooting is what the whole line of 6" revolvers were developed to do even to the point that S&W designed their K22, K32, and K38 to weight the same amount loaded and be identically balanced regardless the caliber. The big old Model of 1950, later of 1955, now known often as the 25-2 for .45 acp came to offer an alternative to the service pistol in matches that allowed it's use for those who prefered to maintain their consistency by using only revolvers in all caliber events.
Casual use of such arms amounts to an insult to their heritage.
So there.
http://www.bullseyepistol.com/