The fastest 135mm telephoto lens in its class. Ideal for indoor sports and portraits with background blur. Two UD-glass elements correct secondary spectrum for outstanding sharpness and color. Compatible with Extender EF 1.4x II and 2x II.
PhotoZone Review: http://photozone.de/8Reviews/lenses/canon_135_2/index.htm
The-digital-picture.com Review: http://www.the-digital-picture.com/Reviews/Canon-EF-135mm-f-2.0-L-USM-Lens-Review.aspx
PBase Samples: http://pbase.com/cameras/canon/ef_135_2u