As the title says, I'm considering getting a Canon 70-200mm f/2.8L IS USM MkII, but I'm looking for suggestions on other lenses to consider.
It's mainly for portraiture - posed and candid. I want it to be very sharp wide open at f2.8, with comparable IQ. IS is important, too! The USM isn't so critical, nor is the 200mm reach (although it would be much appreciated) - so I would consider shorter lenses if they meet all the other requirements.
(PS: I've read this thread, comparing the Canon with a similar non-IS Sigma: http://www.ausphotography.net.au/for...00-f2.8-EX-HSM)