Looking at getting a moderately priced tele for shooting game here in South Africa. From the reviews I've read, there doesn't seem to be a huge difference between these 2. The long end is much more important to me that the short end, and from what I've read, the Pany seems better in this respect. I also like the fact that the Pany doesn't extend when zooming (possibly less dust being sucked in) and it seems to be better built witha meatl mount. I know the Pany is more expensive...any experiences/opinions of these 2 lenses would be appreciated.