Are FX lenses typically sharper lenses than DX?
Look at Ernesto's link as well.
The only difference is that using an FX lens on a DX camera is that the camera crops the field of view. This gives the appearance of magnifying that some claim. But in reality it is merely that the field of view has been cropped by 1.5 times. So if you use a 35mm FX on a crop body the apparent field of view is actually 52mms. As as stated above this means you have cropped down to the sweetest area of an FX lens, the center.
The DX lenses are optimized so that they present an actual field of view, so a 35 DX has a 35mm field of view. It is a matter of how the lens shows the image circle to the sensor is how it is different. You can use both lens types on either format camera, but in the case of an FX body it goes into DX mode to only look at the DX image circle. Until recently this meant a terrible image quality loss when the for example, D700 would do this due to the loss of MPs. The D700, and the D300 had the same MP count so the D300 images still had more room to crop with, as where the D700 lost IQ to do that.
Also the whole FX magnifying myth was started by the manufacturers marketing departments. It was never reality. It only appears once again as if it is happening because of the smaller field of view.
thanks everyone 
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