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It is a sensitive shutter in my experience, but since I use back-button focusing, it's kind of a non issue.
In terms of the low light focusing, I find that when the light levels get REALLY low, then it is slow, but once it acquires focus, it really is in focus. I think the 5D2 felt faster in terms of focus acquisition but it rarely focused correctly to begin with.
Focus assist beam (with an attached 600ex) seems to make it slower than not using focus assist in my experience...although that makes no sense to me at all. Often times I'll forgo...Show more →
Which AF point were you using when experiencing slow focusing? Also, which lens/focal lengths?