I've had them all several times, and it comes down to one thing, what you shoot.
For when my kids were tiny and just layed there the 85 is true MAGIC, nothing comes close. But then they start to move a little bit and the slow 85-AF makes you want to throw it to the wall.
The 135 is creeamy and sharp even wide open, discreet and light. But for me I found that when I was in a situation where it wasn't too long, it was just to short.
The 70-200 have almost everything, blistering AF, with crazy accuracy, the HIGHLY useful (fullframe) focal length and fantastic IQ. The downsides is that it is a beast, heavy and long and forget discreet. But for me that haven't used zooms for years and years, I see now that I crop A LOT because I can't change focal. The 70-200 isn't as long and useless as one might think, it's actually a great indoor focal length for kids ( as they aren't 180cm).
If I could have whatever I want in the lens world, I would absolutely keep the 85 also, the 135 I find is in between what I want, always, so not for me. and the 70-200 is, now once again, a given and most used lens.