f/2.8 would be nice (mostly for flash at f/4), but the 24-120 f/4 is a great lens. It is my easy walk-around-all-day-with-one-lens choice for FX. (120 FX compares to 80mm DX, but many megapixels allow easy cropping).
But in that use, 24mm is not very wide for DX. I think you need to experiment with a 24mm limit before deciding. I previously used the 16-85 for that all-day purpose with DX, it goes much better for wide shots.
Once on vacation, D800 FX was filling up the memory card, and I got the notion to switch it to DX mode to conserve space. But 24mm simply doesn't do it for DX, I was continually switching back to FX mode, to get the width in.
But in that use, 24mm is not very wide for DX. I think you need to experiment with a 24mm limit before deciding. I previously used the 16-85 for that all-day purpose with DX, it goes much better for wide shots.
Once on vacation, D800 FX was filling up the memory card, and I got the notion to switch it to DX mode to conserve space. But 24mm simply doesn't do it for DX, I was continually switching back to FX mode, to get the width in.
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