It is very sharp , it is very fast , it is very well built and it is one of the least expensive L lenses Canon makes. It is the highly regarded Canon EF 135mm f/2L USM Lens. If 135mm is the focal length you need, you will not be disappointed by the 135 L.

Well, first of all, this is a 135mm lens. That means that, this is somewhat considered as a telephoto lens. If you have a Full Frame (FF) camera, this is the lens that you should seriously consider.

The f/2.0 aperture; speedy focus; and solid build

No IS; but not really an issue anyway

I love prime lenses, and this lens has a reputation for being among the sharpest in Canon's arsenal and exceeds expectations. On a full frame body it is a great focal length for candid portraits. On a 1.6x crop body it makes an outstanding telephoto (216mm FOV equivalent).

Price, L build and quality, Focal length, fast focusing USM, fast max aperture, size, weight, focusing limiter, accessories (caps, hood, case) colors, contrast, bokeh, sharp..; RAZOR SHARP

Zero

I bought it for my Canon 40D. No regret at all. It is pretty sharp and focuses really fast. It is very well built but not as heavy as the 85mm F1.2L. It is one of the least expensive "L" lenses. It takes time to get used to the 1.6X crop if you use it with none-full frame body.

Sharp!!!Sharp!!!Sharp!!! Great Colors and Contrast!!!Excellent Bokeh!!

None at all, but I would like to see it comes with IS; The lens hood is awkward to carry around

Canon claims this lens as the fastest 135mm prime lens and we can't find a faster one available. So what use is a fast, short telephoto lens. We take a look.

Fast and silent Autofocus; Simple operation; Good optical quality with nice OOF ‘Bokeh

Price; Unusual size filters

Yes, I would recommend this to a friend

Fast; Sharp Focus

None so far

I bought this lens for indoor dog sports with pretty poor lighting. My EF70-200 IS 2.8L zoom was just not fast enough and I was getting too much noise at the higher ISOs with my 40D. Upgraded to the 5D2 and with this lens I can use ISO 3200 without much noise at all.

Fast; Sharp Focus

None so far

I bought this lens for indoor dog sports with pretty poor lighting. My EF70-200 IS 2.8L zoom was just not fast enough and I was getting too much noise at the higher ISOs with my 40D. Upgraded to the 5D2 and with this lens I can use ISO 3200 without much noise at all.

Fast; Sharp Focus

None so far

Canon EF 135mm f/2.0L USM is one of the fastest telephoto lenses currently being manufactured for the EF mount. Priced at about US$900 (as of June 2007), the lens is not necessarily going to be the first choice for mainstream consumers, but it remains affordable for serious amateurs/prosumers and...

is regarded as one of the best three prime lenses that Canon produce (Along with 85mm f/1.2 L USM and 35mm f/1.4 L USM). The images from this lens are very sharp, contrasty and show a lot of details even in wide open at f/2. The depth of field is very shallow at f/2.

sharpness wide open; built-quality; appealing bokeh

not very versatile (prime lens); slow AF tracking