I own it and use it. Just as nice as the 150, just one stop slower and 50mm longer. With those two exceptions I can't see any difference in my photographs between it and the 150. I use to love it for base running photos in Little League. It is also a very nice long portrait lens. Just don't expect it to fully blur out a messy background if you are shooting environmental portraits. This and the FA 45-85 was my complete lens kit for the 645nii.