Trade in the 70-200 vr1 for f4; FX user

I've used the VR 1 on D700 for some time, and lately on the D800. For portraits, it's absolutely stellar! A little soft at 200mm wide open, but one stop down it's pin sharp. For landscapes, I shoot in 1.2x crop mode on the D800 which gives me a 25 mp image that's sharp across the frame, so if you can live with that compromise, I'd say it's a very good lens overall.