My wife is letting me buy a new camera, and she's actually encouraging me to get a 5D3. Anyway, I'd be getting it with the 24-105 kit lens, but I want to get an additional lens to go with it. At some point in the future I want to get a 70-200mm, but considering I need to get a complete setup (moving from a Four Thirds Olympus E-410), I don't really want to get that straight away.
I'm considering either the 50mm f/1.4 or the 85mm f/1.8. I mainly shoot portraits of family members, and mainly outdoors shots of my toddler and other kids, but I want to start with indoors stuff, hence the fast primes.
Any suggestions which would be a better choice?