"I struggled with this lens a bit today, focus was all over the place. I certainly chalk it up to user error, but man, it's disheartening."
You did a good job the first one, but any camera and lens is going to have trouble with a lower right focus point like on the second one. Unless you focused and re-composed. Shooting and nailing focus on any 1.4 lens is challenging. It definitely takes some practice and skill, and having a higher end camera body doesn't hurt either. Practice with Continuous Autofocus wide open. Don't be discouraged the lens is wonderful.