Yes, there is a learning curive with the 85mm when it's wide open. It took me a while to get more keepers than discards. Two or more subjects can be frustrating to get them both in focus when wide open if you don't set yourself up exactly the same distance away from both/multiple targets. The 24-70 or 70-200 are more idiot proof where you can set the camera and shoot. I find myself having to think a lot more and shoot with more hesitation when I use my 85mm. It's just the nature of the beast. One thing that helped me out is getting a free app for my droid that is a depth of field calculator for Canon lenses. I found that when I starting using this app my pic's turned out better because it provided me with raw numbers on how much depth was available for the distance I was away from my subject(s). After a while I started to remember these numbers and don't really need the app much anymore. The app does help with consistancy and provides you with a better understanding on what you have to work with on a particular setting. Have fun with the new lenses!!
Getting the hang of shooting at 1.2
You're right. Shooting groups wide open is possible with careful consideration to keep everyone on the same plane. Wish I hadn't been so afraid to shoot primes wide open in the past.