My most used lens had to be my 100-400LIS which i use for all my aviation and motor sports shots. My faveourite lens however is my 15mmFisheye. I just love that lens, it is so fun and you can be so creative with it!
My best day with it was Eos3/Ilford Delta 100/15mm fisheye!
I love the 135 2L and use it all of the time since I mainly shoot headshots. Tight ones. Some people find it too long on a 1.6 cam but itīs perfect for my needs.
135 2L without doubt. Unfortunately, I just don't have many opportunities to use it. I may start taking headshots of some players, as Anden does, since that seems like a good idea to me.