Ya, I tried and its look really sharp, that's why i ask the question. Can check with you 1 more thing, That mean all the f2.8 lenses can produce sharper pictures than our kits lens??
Yes, if you're referring to those lenses like 14-24, 24-70, 70-200vrII etc... At f2.8, the lenses are already sharp! For kit lens, you usually have to stop down around 2 stops (on top of the already smaller aperture) to maximise the optical sharpness of the lens.
The price of the lenses are a good indication of the quality of the optics. Thats why a kit lens have "kit lens price".