I'm currently in the market for a telephoto L lens, but stuck between these two. I've never owned nor shot either lens so that's my biggest issue. Here's the question; which one should I buy? I shoot cars so I'd like to have the perfect 16:9 aspect ratio from a distance, but also get more up close if needed. The 100L will basically knock out two birds with one stone due to the extremely small focus distance, but then the 135L has been crowned the king of the L lenses. Which decision should I make? Your help is appreciated!
For me the right answer was 135L. I don't have much interest in macro photography so we looking primarily for a portrait/tele lens and the 135L fits the bill perfectly. It will focus as close as 3 feet, which is generally plenty close enough outside. The sharpness and color rendition of this lens are hard to beat. I have only limited experience with the 100L and its is a wonderful lens as well. Its advantage is of course its macro capability. The 135L is a stop faster and better bokeh.