Having shot with may fair share of L lenses, including my own lenses and others borrowed from CPS, I would have to say i'm quite enjoying my latest lens, the 100L... gives me lots of options I dont get with other lenses... the 135 is nice, but with no IS it has bit me in the butt too many times when my second shooters clamor for that lens. 70-200 is a sweet lens, but i dunno... from the F4 to 2.8's... they just has something that makes me wanting... cant quite pin point it. Haven't tried the 85L... but for what it is... at this point of time, i'd give that title to my 100L