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[Lestat]

i have read the 1.8 is the equal to the 1.4 at many f-stop settings.
for me its not worth the extra $250-$300.

dont worry about the built quality.. you wont even notice it after using it.

you can always pick up a mamiya, zeiss or some other M42 screw mount lens for uber cheap on ebay and just get the M42 to EOS mount adapter.
you use it the good old fasion way but alot of those lenses are unparalleled and for the price the quality is worth every penny x10.
with the M42 screw mount adapter i do not believe you lose much if anything at all, in terms of f=stop but i may be wrong.