Interesting stuff, especially the part about the zoom being "cheaper" because it's par focal. The reason I passed on buying the $2,200 zoom is because it is wider than my mark l lens. I appreciate and welcome the explanations, but side by side the new zoom is clearly different than the old zoom in terms of focal length. 70 mm is barely long enough for my needs and the MK ll comes up short. Of course I'm guessing that it's 20 to 60 mm, not sure what it really is.
What if the 5D Mark lll wasn't quite full-frame, not quite 6 frames per second, didn't really have a 100% viewfinder ?
I wish I could be off by a couple hundred dollars on my payment for the lens and could say it's within tolerance, it's par currency.