I owned the 135 but got rid of it before getting my 70-200 IS II... Isn't it true that the 70-200 IS II sharpness/bokeh comes so close to the 135mm that the 135mm isn't really a noticeable improvement over it? That seems to be the general consensus from what I've read. Same with the 85mm 1.8... Still, the price/weight factors are a solid argument against the 85
The improvement with the 135L over the 70-200 II is certainly noticeable in terms of the thinner DoF, but especially the bokeh (which is a minor weakness of the 70-200 II). Whether that difference is enough to justify owning both is a personaly decision.
The 85/1.8 is one of the best values in the Canon lineup in terms of IQ per $/£/€/¥, but you'd better not have any specular highlights in your frame unless purple is your favorite color and green is your second favorite.