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The ISO charts are up. It looks to me like
The 70-200mm F2.8L II as you would expect is the clear winner over the 70-300 at 70 and 200mm
The 70-300mm seems to be better than the 100-400mm L at both 100mm and 300mm.
[View:http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=113&Camera=453&Sample=0&am p;FLIComp=4&APIComp=1&LensComp=738&Cam eraComp=453&SampleComp=0&FLI=5&API=1]
That seems about right. 70-200 f/2.8 L II is still king of the hill in terms of IQ. The new 70-300L is a little better than the 100-400L, especially at the edges, but not "incredibly" better.
As someone that was considering the 70-300L but bought the 100-400L, I have to say, I am happy with my choice and a little disappointed that the 70-300L isn't sharper. Had the 70-300L been equal too the 70-200 f/2.8 II L in IQ (plus the weather sealing and faster AF over the 100-400L), I would have considered giving up the extra 100 mm and making the switch when prices on the 70-300L came down. But, unless Bryan (or someone on this forum) highlights something I am missing, I think I am keeping the 100-400L.
So, right now, the 70-300L seems mostly to be a good telephoto companion to folks with the EFS 17-55 or EFS 18-55 that don't want one of the shorter but faster 70-200 lenses.
EDIT:
For those interested:
http://www.flickr.com/groups/ef_70-300mm_f4-56l_is_usm/
Also, the "CR" guy made the following comment on a trip to Africa "If I could give you a bit of a hint of what I think about it, I’ve taken less than 10 frames with the 70-200 f/2.8L IS II and a few hundred with the new 70-300L. It’s not for everything, but it’s been great for a lot of things."
Still keeping the 100-400L [:D]
I
Quote:
Originally Posted by Kayaker72
Although I (regrettably) did not yet have a dSLR when I spent a month in Africa, I had a 10x zoom P&S (38-380mm equivalent), and the vast majority of my shots were at one end of the range or the other. If the new 70-300mm is the longest lens he brought, it's going to see the most use. As I stated 'over there,' if CR guy had the 70-200mm f/2.8L IS II, the new 70-300mm L,andthe 100-400mm, I wonder which would be seeing the most use? My money would be on the 100-400mm...
Quote:
Originally Posted by dsiegel5151
Well, the new 70-300mm L zoom is sharper and has less CA than the 70-200mm f/4L IS + 1.4x II, and it's a little sharper and has a little less CA than the 70-200mm f/2.8L IS II + 1.4x II. Plus, it's a lot smaller and lighter than the 70-200 II or 100-400mm, and it's shorter and not substantially heavier that the 70-200mm f/4L IS + 1.4x II and you get the whole 70-300mm range without adding/removing the TC.
To me, this lens isn't a replacement for the 100-400mm (although Canon's marketing department may feel differently). But is an improvement upon the non-L 70-300mm lenses (non-DO and DO) that offers better IQ and weather sealing.
Quote:
Originally Posted by dsiegel5151
Constant f/4? That makes the suitable comparator Nikon's 200-400mm f/4 VR II, a lens which is 15" long, weighs 8 pounds, and costs $6500...
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Neuro,
Good points. I