Visited the Monarch Butterfly Grove in Pismo Beach last week, and shot these (hand held) with the 5D Mk II and 200/1.8 + 1.4x TC .... so I am having to crop these heavily, but the 5D II allows me to do this. I could not have take these with a 12MP body - not without a longer lens.
Thanks guys! I wonder if my XTi with the extra reach but with less megapixels could have done a better job, as I will still have to crop quite a bit to get frame-filling and clutter-free images.