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People mention the difference in bokeh and other qualities of the final picture a lot, but rarely shutter speed. That is what I am more curious about. I have a 70-200VRII that I am falling in love with, but for really low light stuff when I am shooting people, F2.8 often doesn't get me the shutter speeds I need even at ISO 6400, and I don't push my D7K past that point. F1.4 is already 2/3 stop faster than F1.8, but then Ming's article I found really interesting regarding T stops, as he said that in addition to this, even when both are set at F1.8, the F1.4 lens is still getting faster shutter speeds because of less light reflection. So for photojournalists, concert shooters, etc...the 1.4G would be the much better lens when getting the fastest shutter speed possible is the name of the game right? I have read people post that the 2/3 of a stop difference isn't much in practicality, but with those 2/3s PLUS the T stop difference discussed by Ming, it sounds like there might be a significant difference when it comes to available light shooting in very challenging conditions.