I love this camera so much! Of all my long telephoto capable cameras this one nails focus the quickest, may not at the first half press, but quick enough that I get images I might have missed with other cameras!
I have a feeling that if the lens and camera didn't have to deal with shooting through two panes of glass, focus might be quicker.
For those who are wondering, I broke down and just ordered a replacement feeder. This one is getting downright dangerous!