Get the 85L II.
That said, assuming you love shallow DOF photography and buy the 135L now, you will certainly get the 85L II in the not too distant future.
5D3, 6D, 600D, RX100
16-35L, 24-70L II, 70-200L II, 100-400L, 50L, 85L II, 135L, 24TSE, 40, 100 macro, 18-55 II, 55-250 II, 600RT x 4
I come here to learn something new, not to learn how bad my gear is - I know that already ;-)!