Canon 135mm+ Extender EF 1.4X III VS Canon EF 200mm F2.8 L?

Wide open, the 135 + 1.4x is fairly soft and not a match for the 200 2.8, but stopped down a bit, it's not bad. This combo was actually one of my earlier "wildlife" lenses, which worked decently on a crop body.

Here's a peek at the performance:
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=108&Camera=453&Sample=0&FLI=3&API=1&LensComp=245&CameraComp=0&FLIComp=0&APIComp=0

And a sample of what the combo can do at f/4:
i-xbHHWQz-XL.jpg
 
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