JBF,. seriously, if I was not able to compare my MkIII with the MkII, It would have been very difficult to be as confident in my displeasure with the MkIII's AF,
...but the MkII af is so much better, it makes it very easy to spot the short comings.
Since I haven't owned/used a Mk II, I'm curious as to whether there might be a benchmark as to the Mk III AF performance that we could come up with.
I know that my Mk III performs better than my 5D. I don't have a 40D so I can't compare the two of them. I do know that my Mk III can search in low light more than I'd like although I still get shots. I also know that the Mk III can stumble in AI Servo, again more than I'd like, but I don't have a standard to go by.
Does anyone have some idea of how to test these units to evaluate, other than comparing real-world results with a Mk II?