You basicly admit because you don't try to deny it that the Nikon system is better because it is compatable, but then you bring up some review to try and negate the positive.
First, let me tell you, you make my point. I the review, they state the Nikon is superior to the Canon on a crop body and that is what the lens seems to be desined around. Well guess, what, the answer to your question is, YES, this lens is VERY USABLE. Definition, able to be used. You cannot use the Canon EF-S lens on a Canon FF body without modification which would void warranty, this is not usable.
The Nikon camera, you turn it to crop mode and this lens is not only usable but is superior to the Canon lens. But guess what, I can turn it to FF mode and still use it, and instead of letting the camera do the cropping, I can do it myself in photoshop.
One more thing, you did not take their test and play with the settings, looking at falloff, looking at fstops 2.8, 8 and 11. The Nikon performs great even on DX and only the very outer corners show signs of fall off in light and these in most cases for me look good in the picture to help draw your attention to the center or are cropped out, if you crop down even 4 percent you are often still better than the Canon. YOu see I knew this because I own the lens and you didn't because you are looking at some chart. This lens is very usable even on a DX, and is still superior to the Canon at fstops beween 2.7 and 8 above 100mm.
But if you are not convinced, turn the Nikon to crop mode and it blows the Canon out of the water and is still usable in FF mode. Sorry, if you don't see that advantage over the EF-S system that cannot be used, you are in denyal.
Also, there are a few DX EF-S lenses that are superb, many people like yourself poo poo them because they don't understand how to use a chart or how to use the lens. What is really great about the DP review chart, is it shows me how the get the very best out of any lens. for you it is a tool to try to bash other brands.
I shoot both, I don't bash either Nikon or Canon, but I can see where each has superior features and performance. The differnence in performance between the Canon and nikon IS 70-200 2.8 is not enought to make me go out and get the Canon version of this lens even on FF.
Yes, there are some lenses that a pro may use. But more importantly,
once FF comes to the masses in low cost, these lenses will still be
usable on Nikon, not so on Canon.
Define usable. Does this look usable to you on FF from 105 to 200?
http://www.dpreview.com/lensreviews/nikon_70-200_2p8_vr_n15/page5.asp
I think that is not usable even for a consumer. Btw... ALL the EF-S
lens can be used on FF by taking out the rubber part. But who wants
results like the example above?
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A happy Canon user...
http://www.redmin.net