I have the 50mm 1.8 and find it serviceable. I don't use it at 1.8 unless I have too, I usually keep it stopped down to 2.2 or 2.8 where I find it more usable from an IQ standpoint. I hate the build-quality, it's slow to focus, and noisy as all get out!
I was considering the Canon 50 1.4 (or possibly the Sigma), but with already owning the 85 1.8 perhaps a 35mm would be a better choice for a focal length.
Unfortunately, the only "good" option for a 35mm looks like the 1.4L, but dropping $1,300-ish for when I want to maximize DoF seems a bit eccentric
Any thoughts or suggestions?