DB said:
Just goes to show how both Canon + Nikon have become volume sellers, with the emphasis now on shifting product to new customers (especially new emerging markets), rather than focusing on better new products for existing customers.
I am not sure if I agree with this statement. Two top lenses: Nikon's 14-24 f/2.8 and Canon's 70-200 f/2.8L IS Mk2 are clearly new better products for existing customers.
Nikon and Canon are able to sell large volumes of lenses because of their excellent DSLR bodies, extensive lens collections as well as massive support from 3rd party lens sellers (Sigma and Tamron). Sony and the m43 consortium still have a long way to go in terms of lens selection.