Yeah, my nikkor 50mm 1.4 is definately my sharpest lens. (well, it runs neck and neck with my 85mm 1.4)
Also, when lens shopping, don't discount Tamron. They're making some real nice stuff these days. So much so, that they are even making some lens' for Nikon. I bought a Tamron 24-135mm for my wedding business. It's on my camera 75% of the time and delivers some sharp photos.