I'm currently using a Nikon 85/3.5VR Micro with my D300s. I'm thinking about selling it and replacing it with the 105VR or the less expensive Sigma 105 OS. I'm currently using a Sigma 150/2.8 (non OS) with my D700. It's an impressive lens but it's big and heavy and takes up a lot of room in the camera bag. IMO it makes more sense to have a 105 which would work with FX as well as DX and sell the 85VR. I'm not replacing the Sigma 150 but I do want a 105 lens that is useable with both digital formats.