Yeah Iron sights would be amazing. I think the screenshot showed it. From Steam Greenlight. I thought I saw it.
Most of the firearms don't have anything but a small notch close to the end of the barrel, there aren't any sights to them, however it would be nice to have a serverside option to force remove the crosshair for all players on the server. Looking down a barrel would be a nice change.
EDIT; Found it. Not exactly a weapon with a sight, but it's nicer than some arcadey crosshair.