^ only get 85L if you are going to be shooting at f/1.2 90% of the time lol.. thats where it REALLY shines.. nothing even comes close including 85 1.8.
But if you are tight on budget, then 85 1.8 + 135L is a really good combo.. 135 is a really solid lens and takes some amazing pictures as well, as long as you are comfortable with that focal length.
85L is a very specialised portrait lens, you will struggle to shoot sports and moving subjects with it. For sports/moving subjects 85 1.8 is much better as it focuses quicker.
For the price, I think the 135L would be worth trying out and see how much you'd miss the 85mm focal length. I'm planning on the 100Lmm macro and the 135L and see how that combo performs. I have the 50 1.4 and I love that lens wide open, so my guess is 85L 1.2 would be right up my alley, but it is a commitment for sure!