Chris, every time I've borrowed or used a 7D, I've been envious of its AF capabilities compared to my 20D & 5DmkII.
I do like the fact that Canon has small stepping stones up the upgrade path for many of its lenses - e.g. the 200 f/2.8L in addition to 200 f/2L, and as you say the 400 f/5.6L in addition to the f/2.8 and f/4 DO models, etc.
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