An interesting point of view.
The lens can't do all the job. Canon has to wake up and sell better SLR. The best zoom lesn (Dxomark) underperforms on Canon SLR vs Nikon's.
"But if you want to look at it another way, the Tamron on a D800E is about the resolution equal of a Canon Mk II "on a 5DIII — a bit sharper in the center, not quite as sharp in the corners, but pretty even. The Tamron-Nikon combination (for a guy like me looking at shelling out some major bucks soon) is $1,000 cheaper than the Canon-Canon system."
http://www.lensrentals.com/blog/2013/01/a-24-70mm-system-comparison
The lens can't do all the job. Canon has to wake up and sell better SLR. The best zoom lesn (Dxomark) underperforms on Canon SLR vs Nikon's.
"But if you want to look at it another way, the Tamron on a D800E is about the resolution equal of a Canon Mk II "on a 5DIII — a bit sharper in the center, not quite as sharp in the corners, but pretty even. The Tamron-Nikon combination (for a guy like me looking at shelling out some major bucks soon) is $1,000 cheaper than the Canon-Canon system."
http://www.lensrentals.com/blog/2013/01/a-24-70mm-system-comparison