Thinking about pulling the trigger on this bad boy.
Should I just save up for the 70-200 to compliment the 24-70?
If you shoot 1/125 or faster, 135L is a better choice due to lower price tag. With 70-200 f2.8 IS II, you can take the advantage of IS and shoot at slower speed 1/60 or even slower.
I have both. In day time I usually shoot with 135L for better bokeh and less weight. 135L works really well with 5D III in AI servo. I have no problem tracking my kids running around with this lens.
First Photo: 135L + 5D III AI Servo, 4points expansion, case 2
Second Photo: 70-200 f2.8 IS II + 5D III AI Servo, 4points expansion, case 2