The Bokeh can definately be a little busy at times - the tree to the top right of the runner in the third photo (Hartmann) is a case in point.
I much prefer the blurring of the 135L, I like to have a zoom for runners on a straight road race (to maximize the number of frames per runner)...
|_F0A5334-Edit_small by Dester Wallaboo|
from Open Air Fashion Photography
|Old Harry's Rocks by John93Robertson|
from View from the top - Sea