Part One: AF System Comparison
So I have two 7Ds and a 5D MKII. The 5D has the standard choose a single point on AF Servo. Works fine. The 7D has a very nice zone function I use a lot. It sounds like the 70D doesn't have the same exact functions but does have a zone with 19 AF Points all Cross-Type. So can it do center 9, left/right/top/bottom 4 points as a 'zone'?
Part Two: ISO performance
How better is it? Technically 2 generations of crop cameras has been released to this point. Is it better? 7D does a decent job but with no MKII seemingly in the wind I might want to get one or two.
Part Three: Image Quality
Any noticeable difference? Losing some features but is the 70D IQ Improved? Using mostly EF 500mm, 70-200 f/2.8L IS.
Thanks! Can't find any reviews where it shows the actual focus systems.