I had the Sigma 85/1.4 first. The IQ and AF speed were great, but the focus was inconsistent. I sent it in to Sigma along with my 5D3 for them to calibrate it, but it still wasn't right, so I returned it and bought the 85L. That is a nearly perfect lens. I have no complaints, including AF speed, which I find to be perfectly adequate for shots of my 16-month old daughter who never stops moving.
However, I'm now considering trying another copy of the Sigma. Why? Because, as others have pointed out, if it's 95% as good as the 85L then I can use the $1,000 or so I'll net on the transaction to buy another lens, or perhaps an OM-D for travel, which I've been considering. The other thing I preferred about the Sigma was the lower weight and smaller size relative to the 85L.
Although... I could easily imagine selling the 85L and regretting it afterward. It really is a magical lens.