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It's a toss up for me. I would say it runs 50/50 for my EF 85mm f/1.2L or my EF 135mm f/2.0L. They both are great. I'm looking at the 200mm f/2.8L and am dreaming about the 300mm f/2.8L (but ~$4200 is a bit much for me)... Maybe I'll pick up a 5D or it's successor first.
 
On a nikon d200, most used is a sigma 28mm f1.8, not my most liked but a great events lens for those shooting primes. All my used lenses are primes (have a 70-210 zoom that is being retired now I have a 180mm f2.8 and 85mm to replace it)
 
Nothing but the best for portraits?

I hear that the 135mm L is another outstanding lens, and like the 85, sharp as a tack.

The 85L and 135L shine on FF. The 85L is ideal for cropped sensor cameras. The 135L is bit too long (for portraits at least). Unless you're shooting landscapes. Both are two helluva lenses.
 
Lately my 35L has been getting pretty much all of the action. So much so that I'm actually considering selling off some of my other lenses.
 
Beyond a shadow of a doubt, my Canon f2.8 100mm macro. Spectacular closeups, and it's great for tight portraits. I have been dreaming about getting the 50mm f1.4 though. A fast portrait lens is the lens I'm missing, although I'm thinking about getting something in the 16-70 mm range (not exactly those focal lengths, just that interval).

But yeah, since getting the 100mm macro, I've used the kit lens on my 400D about 6 times (maybe 60-80 pics). All the other 5000+ pics have been taken with the macro lens. 😀
 
Right now I'm using various telephoto lenses in order to get shots of the resident geese and their new gosling, and have also been doing a lot of macro shooting of flowers, but normally the lens which loves to hang out on my D3 is the 24-70mm.
 
Right now it's usually my 70-200. However, my 12-24 has been getting some use as well. I'm almost ready to purchase a 17-55 so, that will be mounted a most of the time I'm sure.

Adrien
 
Tamron 28-75 f2.8 has been on my Pentax most of the time. The FA 50 f1.4 a close second, and now that I have a 55-300 it will probably be used a lot outdoors this spring and summer.
 
Usually my 18-135mm lens. I use it for pretty much everything. I use my 50mm just for portrait work.
 
leica-d-vario-elmarit-14-50.jpg

Leica D 14-50 mm F2.8-F3.5
 
Currently my 70-200mm L lens sits on my camera the most, although once I get that 300mm ƒ/2.8 that will probably take it's spot. I get closer to buying the lens by the second 😀.
 
Most of the time I'm running and gunning with the Pentax FA 31mm Limited...

Pentax' primes are superb. I've been using the FA 50 mm f/1.4 for a vast majority of what I shoot, I've got my eye on the new 35mm f/2 1:1 macro limited as well as the FA 77 mm f/1.8 limited.

SLC
 
The beautiful, rugged, ultra-sharp, and compact Nikon 180 2.8 AF-D. It's the ultimate stealth lens for candids. One of the 50's, either the 1.8 or 1.4 depending on my mood, hogs the rest of the time on my D70. When I rented a D300, it was the 28 2.8 AIS that saw the most action.
 
18-55mm kit lens on my Rebel XT (around 50% of the time)
I also use my Tokina 12-24mm f/4 quite a bit (I would say 24% of the time or so) for landscapes and inside my family's store. I use the 50mm f/1.8 the rest of the time, mostly for playing around with the large aperture.
 
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