Koi, true practice makes perfect and one really has to learn how to pull focus (like film) with these cameras.

Overall in the short time I have been using DSLRs again, I did used to shoot film photography long time ago, it has made me much better with my video camera shooting.

One thing of note though, is that you were using a 30mm lens on your 7D, which as I mentioned above make sit easier to hold focus with since it's a much wider lens than running a 50mm on a 7D/550D.

BTW, great colors and imagery in your footage. As well as the audio. I take it that audio was captured off camera?