Your favorite lens is?

[Whopper]

At the moment: 50L --   

[dadgummit]

For me it is the 70-200 f2.8 IS II

[bholliman]

My overall favorite is the 70-200 f2.8L II, but at times I prefer my 24-105L or 35L depending on what type of shooting I'm doing.

[Aglet]

Hands Up!, the 100-400mm L
not the best lens by a long shot, hideous transition zone bokeh but when this thing delivers, it REALLY delivers.  Not my most used lens but has provided some of my most outstanding, mostly nature, images.

[Cory]

I've narrowed it down to:
- Sigma 30 1.4
- Canon 100 2.0
- Canon 200 2.8

[Quasimodo]

my next lens

[charlesa]

The 24 mm TS-E L II 

[Jim K]

My two primes:

On both FF and crop the 500mm f/4L IS
On the FF the 24mm TS-E f/3.5L II

[vmk]

all time fav: 70-200 f2.8L II

[Mr Bean]

It is like asking what song you like best... depends on the mood and the occasion.

Yep. In wildflower season, it's the 100mm IS macro. That pretty much stays on the 5D. At the moment (summer here in Oz) wildflower season is over, so the 300mm f4 stays on the body, for bird pic's (Eastern Spine-bills and other small birds are hanging around at the moment). In 3-4 months, as the weather cools off, I'll move towards the 40mm pancake, for the moody, misty conditions around the hills

[sdsr]

135L (though I end up using other lenses more often because I usually want more or less reach).

[Don Haines]

100L Macro.... great for portraits and fantastic for seeing the world differently

[Alex]

400mm 2.8 mkII

[dickgrafixstop]

Leica 80mm Summilux with fotodiox adapter to EF mount. 

[bycostello]

100mm macro