awesome review thanks for doing that for me dustin!
from looking at it I have to agree with your take the tamron does seem to have noticably smoother bokeh
and it is clear the tamron would be sharper in the corners than a mk1 24-70 canon its here the 40mm blows the doors off the canon
also your pros /cons list forgot to give the IS win to the tamron
So now with some perspective of how it compares to a stellar lens like the shorty 40 its looking like a very good lens!
1 more question how are you going with the reverse direction zoom ring? is it wierd ?