Lastcoyote, I see that you have the 100L as well. I've been debating on the purchase of the 135L. I'm really not interested in the 70-200 due to its size, weight, and conspicuousness. I'd be curious to see what your thoughts are regarding having both the 100L and 135L, and if there is enough to justify both in one's camera bag. Obviously, one doesn't go to f/2 and one doesn't do macro, but I figured I'd ask given the similar focal length. Cheers, and good luck with the lens.
yeah i debated getting the 135L for a while now considering i have the 100L.
actually from reading lots on various forums on the web it's quite surprising how many people do have both of these lenses.
as you can see from my sig i'm rather in to my macro photography. started off with the 100L and then got the MP-E 65 which is of course a very specialised bit of kit indeed. i've used these lenses on my 40D for quite a while now.
now I have the 5D MK III i was really looking for a good close portrait lens. the 100L does ok for this but from what I've read of the 135L i think i'll just love it and will prefer that extra bit of reach on the full frame. i'm quite a shallow DOF lover and like to use it as much as I can for creative effect. photography is my hobby so I can take shots just how I want rather than to please others which is nice
the faster AF of the 135L will be handy. also i'm hoping to use this for gigs/theater etc.
the reputation of this lens is certainly a motivating factor too. but overall i think it'll be useful for various aspects of my photography desires.
for you it may possibly be a slightly more difficult decision as you not only have the 100L but the 85L as well.