Quote Originally Posted by Mark Elberson


Comparing 400mm @ f/5.6 vs 420mm @ f/5.6 it's hands down the EF 100-400mm f/4.5-5.6L IS


[url="http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=113&Camera=453&Sample=0&am p;FLIComp=1&APIComp=1&LensComp=111&Cam eraComp=453&SampleComp=0&FLI=7&API=0]Digital SLR and Lens Image Quality Comparison - ISO 12233 Chart 100% Crops[/url]
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Yep. It is. Thanks, Mark.