Hello, I was wondering if anyone had heard about either of these lenses? 1- 28-70mm f2.8-4 Zoom Lens Pro(retail $599) 2- 70-300mm f4-5.6 APO Zoom Macro super 2 pro lens(retail $599) I got these yesterday but they seem to be nicer than what I expected. I called the store and the guy told me that these are newly introduced lenses by Sigma that were just released to the United States. Does anyone know this to be true? I thought it was a load of crap until I tried to find the 28-70 Zoom lens PRO and had no success.