Hmmm...
Not sure about your reference?
What I have noticed, with the 109's in particular, is the antiglare plate infront of the actual sight.
That antiglare plate makes seeing the enemy aircraft very difficult or even next to impossible when looking downward, over certain terrains, on certain maps at certain times of the AH day.
Only way I KNOW a plane is there is I followed it down and sometimes I still see the icon.
I have requested that the anitglare plate be made movable, perhaps by using a new key control.