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even on older glass I would think you could get sharper results with a 200mm prime than a zoom - whilst your 400mm to 800 would certainly (as the bigma has well demonstrated) be sharper still - though 1600mm from a 400mm would be interesting to see!
ahh the choices for one with more than one system
Go Canon - Go Canon - Go Canon
Oh and this is not a %100 crop, its the full frame shot just resized...told you it was soft...
Amazing thing is, it still autofocused...slowly..lol