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!