I think it depends on how/where you shoot, how much you like to change lenses, and what else is in your kit.

A good friend of mine who is a pro sold his 135L and 85 f1.2 to buy the 70-200 f2.8 II when it came out. He worshiped those lenses but found that he wasn't using them enough to justify having them, and he didn't have anything longer than 135mm. He now worships the 70-200, uses it extensively and hasn't looked back. BUT, and this is a big but, he has the 50 f1.2 for low light.

Here's one consideration, which was a major factor in my friend's decision: even on his 5dII, he felt the 85 was often too long to use indoors. On your 7D, an 85mm lens won't get much use indoors unless it's a very large space. I have the 85 f1.8, and it's rare that I use it indoors. In fact, I sold my 50 f1.4, in part, because it was often too long indoors.

Good luck!