I've had (or have) the 24--105, 35/1.4, 85/1.2, and 135/2 for the 5DII. My favorite of the Canons is the 35/1.4 for versatility, sharpness, and low light capabilities, followed by the 135/2 for sharpness, fast AF, and ease of use.
My favorite lens is the Zeiss 100/2.0 macro, followed by the 21/2.8.