Thanks Klaus! Now it's pretty obvious why I'm considering the Tamron and the Samyang, but not this Sigma (if the old EX was sexy, this one is... BBW in comparison. 
) If the stars are finally aligned, your tests of these two will probably will be the last argument in favour of one of those two.
) If the stars are finally aligned, your tests of these two will probably will be the last argument in favour of one of those two.