In my case, it's size. I'm not really concerned with weight, but the smaller size of the 70-300L makes it a great travel telezoom.
Agreed that it looks very promising. The MTF with the 1.4xIII is quite good. I'm slightly tempted by this lens, but I doubt I'll succumb to that temptation. The TS-E 17mm is next up for me (and soon, as it looks like I'll have some travel to urban destinations coming up). After that, I'd likely put the money towards a 300/2.8 II (or a 35/1.4L II if one comes out) before the 100-400 II, then there may be a 1D X II along...





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