My first L series lens was my 70-200 f/4 that I still use today! It started me off into the dreaded "L Series Disease" that has fueled my passion for photography and kept my bank account money poor!
It all depends on what I am photographing as to which of my lenses is my favorite. My 2 main lenses that I go to are my Canon 17-40 L or my Canon 400 f/5.6 L telephoto. Both of these lenses give me excellent photos. I also use my old 70-200 f/4 L l...