mas lami gyud tuod ang 135 2.0 L because on a 1.6x crop body, you have, at the fraction of the price, an equivalent of the new 200 2.0 L IS. although some would argue that an f/2.0 lens behaves as a f/2.8 lens when coupled with a 1.6x crop body. don't ask me. i don't know why. it has something to do with optics and the smaller sensor.