Thanks for all the responses. There are some good points made and it seems that the f4 shouldn't be a deterent from getting this lens. I'm still new and haven't gotten into lanscapes yet so I would probably use the lens for general photography purposes for now. I have 50mm and 85mm primes and love them for portraits. If the rumors are true that a 16 - 35 2.8 vr is coming out in the near future...should I just hold off for now? Or go ahead and purchase and resell IF the newer lens is amazing..?