Disclaimer: I am NOT sponsored by anyone, except I was loaned $7K in camera gear for this competition - $5500 of it was Canon mount gear...
With another situation... very similar priced camera from Canon and Pentax:
The Canon 40D vs. Pentax K20D... posted in this thread:
https://www.pentaxforums.com/forums/pentax-dslr-discussion/29903-canon-40d-vs...rspective.html
I was surprised at the noise levels of the 40D at ISO 800 in relatively bright conditions (
no samples yet, but very, very soon!), even though NR was enabled for higher ISOs... yet I was berated for "my opinion" of using it in sometimes good, sometimes difficult lighting conditions on DPR by several folks for it's high noise levels and their claim that the Canon was superior, according to a bunch of lab tests... sorry, this is life, real world conditions!
(competition rules disallow red eye removal, so using a flash was a roll of the dice at best, therefore no flash was used after several tries - too many lost opportunities)
Well, I tried it under difficult outdoor situations, and many times it fell short of being accurate AF too. Fast, yes, but my 40D didn't do very well in low light or when focusing on very small birds, even though they were stationary! Higher apertures didn't do much either, and that's generally not recommended, since you want OOF backgrounds. The K20D's AF was slower, but generally more accurate.
Regards,
Marc