Upload & Sell: Off
Well, you have to assume that if your using Canon glass, your also using a Canon body. Did you want rapidly locking auto-focus with that?? Sorry, can't have it.
Even the 1DIV had a hit ratio of only 40%(that was with a 500mm Canon stablized lens-on a production shoot). You'd be amazed at how far a photographer can throw the whole set-up. Yes, he actually pitched the whole setup, it came crashing to the ground, no worse for wear.
That same professional photographer was also the "beta-tester" for the Mark IV, and had been with Canon for years.
After hearing his problems with the new Mark IV, I loaned him my lowly Nikon D300+300VR lens. He went out, did a product shoot, and came back grinning from ear to ear. His keepers?? 93%!!!!
He's since changed over completely to Nanon, and has told me that with only a couple of exceptions-none of those being long lenses, Nikon kicks Canon to the curb.
I hate to say this, because I know I'll just get "crushed" by all the internet experts. But doesn't it make you wonder about a company that is so insecure, that they have to paint their lenses white to separate them from the pack, to get you to buy them??
Canon has been, and probably always will be, more geared toward the consumer. Nikon has always been, and will probably always be, more geared towards the professional.
P.S. I will not be replying to the many "jabs" and "pokes" I receive. This has just been my experience, and that of a professional photographer friend of mine.