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interesting, no zeiss?
I would love for you to post some pics on this thread, especially if its zeiss on a canon body (to stay relevant to the topic)
Nothing on the EF-S 18-135mm?
The best way to go is to get the Nikons which have manual aperture rings, and use good adapters, and that way they will also work on Nikon mounts.
... consider what they cost.
Answer to Q1.
I think you can't compare the 11-16 to the other two because it is of different focal lengths. When comparing the 11-16 to others in its league the 11-16, IMO clearly shines.
Be careful with the Tamron, they have quality control issues, some copies are better than others. IMO, if you have a good copy it will be more useful than the canon, if not it would be the other way round. My first post on this thread has a link to Bob Atkins site which contains many lens reviews, including these two lenses.
http://www.bobatkins.com/photography/reviews/ef-s_17-85_review.html
http://www.bobatkins.com/photography/reviews/tamron_17-50_VC_review.html
Answer to Q2.
Turning the end focus should feel different when AF is off. If AF is on you would feel resistance. If they feel the same there might be a problem with the lens. Please don't forget this is a very inexpensive lens and should not be compared to lenses with similar range that cost $400+
My earlier posts about this lens highlighted the fact that it covers 3 useful lengths in film making and that it wins in sharpness tests when compared to the 28-135 and the 28-105.
It's OK for the price, but cannot use a variable aperture lens effectively under pressure shooting HD.