Option 1 (or 3
) for me.
I've had the 85LII and the 85 1.8 both at the same time. Sold the 85L.
The difference between the 2 is not huge (but the price is).
85L has f1.2, slightly better color/contrast and better bokeh.
The 1.8 is a LOT lighter, focusses a lot faster and also has great IQ. Really very similar when comparing it side to side to the 85L at the same f-stop.
Main difference regarding IQ for me is the transition from in-focus to out-of-focus parts. Smoother with the 85L.
I also have a 5DII and 5D. If you 're used to your 5DII the 5D will feel... old. Still a great camera with amazing IQ, but the feeling of it is different. I like the more responsive feel of the mark II and the extra bells & whistles like live view and a vastly better LCD screen.
I mostly used the 85L on the 5D. It performed better on my 5DII. Consistantly more keepers when using it on the 5DII.
More people noticed that when I told about it on this forum earlier.
Conclusion:
I would keep the 5DII and buy the 85mm 1.8.
Use it... see if you'll really like the focal length.
You can still upgrade to the 85L in the future... OR a 135L if you're not feeling that hooked on the 85mm focal length.
(IMO the 135L is a better lens than the 85L , if you like 135mm.)