I got to play with a 100-400L
 

<a href="http://www.flickr.com/photos/40483547@N07/4314681020/" target="_blank"><img src="http://farm5.static.flickr.com/4011/4314681020_37ed4c17ca_b.jpg" border="0" alt="" /></a></p>
<p><a href="http://www.flickr.com/photos/40483547@N07/4314681320/" target="_blank"><img src="http://farm5.static.flickr.com/4063/4314681320_0aba4579fd_b.jpg" border="0" alt="" /></p>
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<p><a href="http://www.flickr.com/photos/40483547@N07/4313945269/" target="_blank"><img src="http://farm5.static.flickr.com/4020/4313945269_f1f087bd2d_b.jpg" border="0" alt="" /></a></p>
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<p>All taken at 400mm f/5.6</p>
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