It's the curse of the 5D2 sequel.
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If it can out-resolve the 7D, It should Out-resolve the 46Mp camera.This is not a fair test. All lenses have better resolution in the center area of the image. APS-C (7D etc) usese this area only. In FF the full field is being used, and the resolution for off enter area will drop. Some might even drop drastically.
The 135L is one of those lenses.