You might be the first person to ever lodge this complaint. Your viewfinder can never be too big! Even old film cameras often blow current FF's out of the water with better finders. If there's anything to complain about, its that the text/info in the viewfinder of FF cameras is smaller than APS-C cameras. But a bigger, brighter tunnel in which to compose your photos is always better. Spend a month with your 6D and then try going back to a smaller finder! They are truly tiny...
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