Way back in the 1970's I produced a tight head and shoulder portrait of my lady friend, with a 55mm Nikon Macro lens in strong lighting on Kodachrome film stock. I loved the sharpness. She screamed "I DON"T need a photographer, I NEED a plastic surgeon"! Yes sometimes things can be too sharp.
Many (typically German) 85-90mm f/2.8 lenses are "too" sharp or harsh-looking for flattering or pleasing portraits. In some cases that also corresponds with less than ideal bokeh.
Their f/2.0 or f/1.4 brothers are usually softer at full aperture and better suited for portraits, usually throwing in great bokeh as well (the Nikkor 105 f/2.5 also has this behaviour).
For non-portrait use, those "too-sharp" lenses are usually great!
There are some sharp lenses out there, notably the enlarger lenses come to my mind. In 35mm photography probably the sharpest lenses are the short tele like the 75/2 Apo Summicron ASPH, 100/2.8 APO MAkro Elmarit, the Zeiss Makro Planar 100/2 ZF and the Sonnar 85/2 ZM. The MTF curves of these lenses even wide open will show you the 40lp/mm line horizontal and well above 60, stopped down above 80, for the moment nothing gets really better than that in the 35mm photography. I use the MP 100/2, and with some sharp film the results can be frightening: http://www.flickr.com/photos/5917703...17250/sizes/l/ BTW, the bokeh of this lens is wonderful.
A lens too sharp?? A girl too pretty?? Having too much money?? Easter Bunny??? 4 things that don't exist. But I find that there are other factor than sharpness that go into making a great lens. 99% of the lenses have an acceptable degree of sharpness.