I would wait for absolutely reliable source to test the new "PF" lens, any of them, if lower mass and size of the new one isn't the imperative factor to get it immediately. My own experience with new "FL" 300/4 and older AFS version clearly shows - do not rush! And yes - "E" lenses deliver a bit less vibrations, compare to "G" version, a hair less, but you are able to see this hair difference when your unit is on the tripod, not hand-held, of course. THX! LZ