I usually stop down to F4 or 5.6 for more DOF and once in a while let her rip at F1.2. Sure does blur out the ugly shit in the harsh midday sun (5D/50 1.2L) It's a giant topical fern in case you can't tell what it is.
I didn't know you are shooting this kind of birds Great lens, right? I own 85L before and for sure it messed 50L reputation but still great L!!! No way I will change it ...