As Troy mentioned, I also use hyperfocal distance focusing for my landscapes and have had great success.
I typically shoot when it's dark and auto-focus can have a really difficult time, especially when trying to hunt through dark foliage.
I'm quite lucky as I haven't had to calibrate any of my L-series lenses through the lens microadjustment feature in the 5D Mark II.
Dennis, your statement implies that you've used (or tried out) every single DSLR Canon has ever made. Yes, there were major issues with the 1D/1Ds Mark III, and it took Canon a while to acknowledge the problem and resolve it. The 1D Mark IV is receiving a lot of praise for having quite possibly the finest auto focus mechanism around today.
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