Basically I have an opportunity to buy 70-200 f/2.8 IS MK II brand new for $2k.
I found myself rarely shoot 60D since I got 5Dc a year ago. Only exception is when I need more reach, I would shoot with 55-250 with 60D. Lately I've realized that I do need a 70-200 f/2.8 lens for its versatility on FF. I'll have to sell 60D and the EF-S lenses if I'm to buy the 70-200 MK II. However 200mm on FF is a bit short for me. I need something to replace the 55-250 + 60D combo.
I've seen sample pics of 70-200 MK II + 2x III and they look very good to me.
How about 70-200 MK II + 2x kenko? Is the PQ and AF better than 55-250 + 60D combo?