CNET did not review the Sharp LC-60LE600U, but we did review a similar product, the Sharp LC-60LE640U.
According to Sharp's Web site and a Sharp representative we spoke with, the main difference between the two 60-inch LED TVs TVs is that the 640U has Smart TV, including built-in Wi-Fi, while the 600U lacks both of these features. The 600U also has less connectivity, with three HDMI inputs, one composite video input, no VGA-style PC input, and no USB port. It cannot play back music, photos, or video over USB or DLNA.
The 600U weighs about 1 pound less than the 640U, but they have the same dimensions.
Otherwise the two TVs are basically identical and we expect their picture quality to be very similar. For more information, check out the full review of the Sharp LC-60LE640U.