I am planning on buying a lens setup for up to 400mm within the next couple weeks and i ran into a little dilemma. I had my heart set on 400mm 5.6 until i ran across rave reviews about the 70-200 2.8 is II with the newest 2x tc. Everyone seems to love it including arthur morris, and recommends it over the 100-400, but I haven't seen it much compared to 400 5.6. Since i already own the 70-200 2.8 non is, I could sell it to make up the difference in price between the two. If anyone could show me 400mm test shots of both, I would be able to make up my mind.