We did October 28th- Nov 4th last year. I didn't get to see as much Christmas as I had hoped. There weren't any at AK and Epcot by the time we left. DHS was decked out on November 1st (including the big tree around the lake). These pictures are from November 1st.
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MK had some decorations up on November 1st, but the tree doesn't go up that early. They were playing Christmas music on Main Street. Here's a comparison of the entrance decorations from October 30th and November 1st
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Pictures are probably blurry.. I don't have the best iPhone lol