Earlier this year I got a very welcome gift (from my lovely husband, bless his socks) of the 200mm f/2.8L . It's a beauty of a lens, but it's definitely not an all-purpose one, as it's pretty limiting in terms of what you can shoot with it. Due to the long focal length, you need to be able to maintain a fair distance from your subject, so if you have a younger child you need to keep near you, it's not really much use. However, it excels at two things - sports and portraits. I have already tried it out on sports, which was great, but I have never really gotten around to testing it out on the portrait front as my son - having the attention span of a gnat - wouldn't stay in one place long enough for me to test it out (although I do have some lovely shots of the back of his head...) So I borrowed a much more willing - and quite frankly, much prettier! - model to test it out on.
Unfortunately, I missed focus quite a few times and I'm pretty sure this was mainly down to user error, not with the lens itself. Although it's not as heavy as the 70-200mm f/2.8L (which I lusted after but didn't think would suit me due to it's size, weight and oh, the small question of dropping 2k on a lens) it's still fairly tank like, and I think I struggled a bit with having that extra weight on the front. As with all things, practice makes perfect, so I off to try to get another model for Round 2!