Macro is only part of what the 100L does well. I shoot plenty of video, and yes - the 100L is awesome for video. The hybrid IS is fantastic, and it's tack sharp.
I don't use it quite as often nowadays, since picking up the 70-200 2.8 IS II (also 2.8, also hybrid IS, also tack sharp), but before I had that in my bag, the 100L was one of my most frequently used lenses for video.
The 135 also produces a gorgeous picture in video, but isn't quite as versatile, performing best when you have it locked down. Since there's no IS, you get micro jitters like crazy. Get focus, then for the love of god stop touching the camera! ha