I recently shot a wedding with the 135L and loved it! It was ridiculously sharp wide open and focuses super fsat. The only problem with the lens I find is that it is too long for most situations. I own a 7D, so I switched off to my 17-55; and it did not satisfy like the 135 did. I am 95% considering switching to primes fully. I brought along my 70-200 2.8IS for the wedding and did not once mount it on my camera. I chose the 135L 100% of the time. I owned the 85 1.2 before; and even though it is tack sharp, it focuses too slowly for walking and other active situations. Now I need to find out which lenses are just as sharp, if not sharper, than the 135L and focuses just as quickly in low light? Thanks for any help.