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It's not the OM-D's accuracy, per se, it's the ability to place it directly on a focus point. I don't use pinpoint mode on the GX1 often, but the smallest box on the GX1 is about 4x smaller than the boxes on the OM-D, and even the magnify box at 14x isn't as small or precise. The OM-D is very accurate (it nails focus within the focus point box), but it's not as precise (it's harder to place that focus exactly where the user wants it). I also find the OM-D hunts more in very low light compared to the GX1, though both are superior to my 1Ds II in that regard.