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I'm mainly shooting adventure stuff like campfire nights, landscapes and "journey" pictures so I'm looking for something a bit more flexible then my Canon 14mm 2.8

So to those of you who bought the F4 IS version over the 2.8? did the loss of light effect your photography in any way? & is there any other advantage to the F4 IS version besides IS and the much better sharpness that everyone says it has?