Canon Lenses Quality

What is the difference in image quality between Nikon, Canon, Sigma and Tamron?

The lenses of the same brand of image capture The other strong brands?

1) the image quality is almost the same in the early years. 2) Canon and Nikon lenses tend to last for decades without problems. 3) Nikon and Canon models feature non-generic property of the lens can include in their glasses. 4) Sharpness of the objective lens varies according to its characteristics. 5) the fact that most professionals use only OEM lenses, should give you an idea what goal you can find your needs.

Nikon d90 vs Canon 7D video quality Multi angle and slow mo