Thanks to the feed from Blab, Canon have announced information regarding the accuracy of mark111 Af performance.
Link to Canon announcement is here for you. (for UK sites, for other countries, please check via your Country Canon support sites)
Also good news by the looks of it for the dreaded Err99 syndrome.
This is not a problem that I have ever seen with my Mark111, but I know it happened to Dave on more than one occasion.
Let us know about your experiences with the Mark111 since the last firmware updates from earlier last year.
Also good to see that Canon are not just leaving users, as I have seen written by others elsewhere.