I currently own a Canon 70-200mm f/4 non-IS. I now want to upgrade to an f/2.8 WITH IS, however, don't really want to spend the $1,700 or $1,800 for a brand new one.
What are your thoughts on the Sigma and/or Tamron version of the above. Looks like those may be $600 or more less expensive (Brand New). I would appreciate any comments.
Alternatively, would looking to buy a USED Canon 70-200mm f/2.8L IS II also make sense as those as the market in the $1,400 - $1,500 range.