If your purpose of using the Sigma 1.4 is to only use it between f/1.6 & f/3.5, I'd just hold onto the Canon 85mm 1.8 and don't buy the Sigma 85mm 1.4. I have the Sigma and love it, AF even works fast enough for indoor sports, but if I didn't find myself using the lens at f/1.4 enough, I wouldn't hesitate to trade it for a Canon 1.8 and pocket the cash difference.
As for the 135L...I only have a 7D, so I find 85mm on it to be great for multiple things, so for your 5D, I'd keep the 135L unless you don't use it.








