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Could you explain "creamy sharpness"?
In my personal experiences, having shot them both side by side with the same lens on the same subjects multiple times, my copies didn't exhibit such a profound difference. The 1D4 is better definitely, and I love mine to death, but the 7D is a great backup to the 1D4, with the only worries I have with it is to nail exposure more perfectly than on the 1D4.
Here is a test shot taken from my head to head at ISO 100, the best you are going to get from both. This shows the reach advantage, and if I resize that 7D down, the 1D4 is just a tad sharper, basically nothing a photoshop USM of 40% at .4 radius, 0 threshold doesn't fix up. That is a very small amount of sharpening needed. Now at higher ISOs, the differences are a bit more noticeable since the 1D4 does better higher ISOs, and thus less detail lost to NR overall.
Here is ISO 1600 side by side, with no resizing, what I did here was change the focal length from 100mm on the 7d to 130mm on the 1D4. If I had kept them both at 100mm, I could have resized the 7d down to the 1D4 resolution, and it would have reduced the differences between them. This at least shows the noise difference between each of them at 100% view, the impacts of 30mm on DOF, and what the difference in AA filter (I assume) is doing to the IQ on each.
Here, a USM of 70, .4. 0 brings the 7D in alignment with the 1D4, so we have gone from a USM % of 40 to 70 in 4 stops ISO, almost double. I don't have a test as such, but if I extrapolate out to ISO 12800, I would need a USM of nearly double again, so a value of around 140, .4. 0 to equalize or better the 1D4.
As to wildlife galleries, I am confined to what is in my back yard, and what is at the local zoo, so nothing crazy or dramatic to compare.
1D4 duck shot at ISO 6400
7D duck shot at ISO 6400 (using the drab female vs the drake above just doesn't seem fair does it? )
All these comparisons are probably making everyone feel like this little fellow, so I will stop!
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