Hey nic, thanks for sharing.
Apparently quite sharp, but as u mentioned, af slightly slower. But dealers dun stock it any more: they prefer to sell the bigmas and the 150-500 as more pp buying, and I noticed they also marked up the price for those 2 sigmas, previously selling 1600 & 1800 last yr, but now they increased it $50 bucks and $100 bucks respectively. Time to boycott.
Maybe try internet purchase or via Hong Kong.