I am a Pentax user and I am looking at Nikon or canon for wildlife work. I have to say from using a 7D its has one of the worst control setups of any camera. If anyone has used a K7 or K5 you would be much happier you can think about taking good pics instead of fighting with the camera. Unless you need fast AF then pentax is behind in that.
I disagree, The 7D has fantastic ergonomics and handling.
It is a free country, disagreement is your right :-)
After owning several Pentax dslrs I will admit their owners do become loyalists and the af is not that far behind ( actually kicks the 5d mkii in the teeth with af ). Now after using a 7D and owning the 5d mkii I can say in comparisons the Pentax k7 and k5 the ergonomics are more user friendly which probably helps their user satisfaction ratings and the system is rather tough with good enough affordable lenses for prosumer use. But the system is closed with no upgrade path beyond aps-c unless you jump to medium format, this is why I also own a 5D mkii and pray everyday for canon to buy out Pentax and learn something about designing camera control systems.
Reading the Pentax forums one does get the impression that at least some "Pentaxians" are almost paranoid in their loyalty, if anything more anti-Canon/Nikon than some Canon fans are anti-Nikon (and vice versa).
I moved up to a Pentax K-5 from a Nikon D3100 and was very pleased by the various improvements involved - not the least of which was the effective in-camera anti-shake mechanism, whose obvious advantages hardly need spelling out. Yes, the camera's very well designed, and you can take very good photos with it.
But I wanted full-frame and, like you, bought a 5Dii (I've just finished selling off my Pentax gear to help pay for it and various lenses). Unlike you, I don't think the K-5's autofocus is better - though all I ever use is center-point focus and it's hard to tell anyway as Canon's lenses seem to have better automatic focus than any Pentax or made-for-Pentax lens I've tried. I also think it's easier to get the exposure right in the 5Dii. (In fact, my sole operational complaint with the Canon is the rather trivial one that it can't automatically create a new folder each day on the memory card.)
But perhaps the main point for me is lens quality (though I didn't appreciate this until after I jumped ship): in my experience, not only are Canon's better lenses superior in terms of optics and mechanical performance (often at a price, of course), but there are more of them in current production to choose from (not to mention that more third party lenses come in Canon/Nikon mounts than in Pentax mounts and that DxO, for one, has far more modules for Canon lenses than it does for Pentax). More than a few Pentax lenses themselves look better, but it's the results that count; for instance, the new Canon 40mm pancake lens looks and feels crude and cheap next to the Pentax equivalent, but it works better and takes photos that probably look better too. I bought a Rebel t3i as a backup camera, and while in terms of build and design it's inferior in many ways to the k-5, the photos it takes aren't; quite the opposite (except perhaps in the lowest light), probably.
It was amusing to read this sentence in the cited report above: "Pentax performs particularly well in durability and reliability; variety of features; ease of operation; and shutter speed/lag time, while Canon performs well in the picture quality factor." As with so many reviews found on-line, one could be forgiven for thinking that "the picture quality factor" (what a phrase!) isn't that important....