Welcome Lizzy!
I'm going to go against the grain here. Especially considering that you're coming from film (pre-pixel peeping). Small focus errors due to focus and re-composing are difficult to detect on film--especially when you're not printing anything larger than 8x10 at the local drug store.
Consider that if you're shooting between f2 and f4, the one decided advantage of the L is rendered meaningless--it's f1.2 aperture. In it's place, you end up with a focusing speed deficit, which is arguably more important when shooting candids of kids.
The 85L is one of those lenses that has quite a steep learning curve. Add that to the learning curve of switching to digital, and post processing, et al, and it can become overwhelming. Add to that the availability of a very capable and much less expensive brother that boasts impeccable credentials itself, I wouldn't recommend it for your stated purpose.
I would say use your existing 85 f1.8 on the new awesome 5D II and shoot wide open at f1.8 and see what you get first before plonking down all that cash for an 85L. It could buy a lot of other lenses that you may need, or computer hardware and software.
Here are some portraits with the 85 f1.8 on a 20D:
#1. @ f2
#2. @ f2.5
#3. @ f2
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#4. @ f2
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#5. @ f2.2
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#6. @ f2.8
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