Both are a bit pricey and don't turn up all that often. Before canyon
upgraded their wide angle zooms the 21 F2 was really selling at a
premium.
Unless you require the improved close up performance with the floating
elements of the 21 F2 perhaps consider the even more diminutive
21/3.5--compares very well
in resolution/distortion/CA--see below.
http://16-9.net/lens_tests/best19_21.html
For some idea of prices on yabe or KEH Jim's data from FM isn't too old:
http://www.jcolwell.ca/photography/lens$db/index.htm
Mike
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