If you were to remove the lens with board from the camera and hold it at an angle to a bright light source you will notice it has a slight blue or purple case to both the front and rear cells. The tint is the lens coating. As others have said this is a single coated lens as opposed to several coating layers on the front element. The coating or number of coating layers is not the cause of lack of sharpness.
Are you shooting hand held?
What shutter speed?
Place the camera on a solid tripod and use a cable release to check the sharpness. Some tripods transmit vibration from any source to the camera causing a lack of sharpness. Some camera bodies are not capable of making critically sharp photos, that is why they were labeled amateur cameras when new.
The shutter running rough can be causing the problem also.
The lens is a f4.5 reduced to f4.7 and is described in this Wollensak catalog:
Last edited by shutterfinger; 05-28-2014 at 10:31 PM. Click to view previous post history.