I had a 7D2 for ten months and got spectacular results.... then every shot was murky. Three trips back to Canon CPS service. Right before I sent it back the third time, I purchased my 1D IV and I was back having fun again. Canon eventually replaced the 7D2 with a brand new one, but I just couldn't manage to try it so I sold it to a young man.
I'll let you know after I get to know the 1D X2. I'm hoping to have fun with it.