LOL. Sacrilege indeed I actually had 135L in my bag when I was shooting that day. I think 85mm is a more workable lens for kids. 135L might be better in other respects but it requires more time for setup. Sometimes keeping distance is great, especially for candids. But if you are working with posed shots for kids then I prefer to be a bit closer - more communication with the subject and more control. Faster angles too. I always liked the 85mm 1.8 but now on FF I just love it.
I'm going to commit sacrilege on CR:
I think I prefer this lens to the 135L