A few years ago there was an article in a gun magazine. Since its been a while I may have the exact numbers or a detail wrong. I'm confident on the substance, though.
A police department interviewed something like 28 officers who had been involved in shootings on duty.
Something like 20 of the officers had hit their target. The rest missed.
The amazing piece of information was that none of the miss-ers could remember seeing their sights. All of the hitters could remember seeing their sights.