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It's hard to follow the foot fungus guy (LOL!), but changing back to lenses, hopefully without fungus, the 85 f1.4 has probably got decent optics, but old Vivitars can be mechanically poor. If there's anyway to handle it first, that would be good.
Note: Do not soak your lens in Listerine vinegar.
I am not sure it is an improvement.
The Canon has USM autofocus which may be very important for stills. The difference between the two is what? half a stop? Not that much. Both are sharp. The Vivitar has better focus ring for manual focusing and manual aperture. For sure it may be more value for money if you are thinking between the two. But if you already have the Canon I don't know if it is a great deal to buy the Vivitar and dump the Canon.