Which company has better quality control? Nikon, Tamron, Tokina or Sigma?

If you see my posting history, I just bought myself a Christmas gift in late 2012 (Nikon D600 + Nikon 24-85mm VR).

Now I am in the process of building my full-frame lens collection:

1) telezoom (70-200mm VR or VC; haven't decided whether to go for f/2.8 or f/4),

2) Macro (in the 100mm  until 150mm range; with or without VR), etc.

In your opinion, which company should I invest my money in? (which company has better quality control at the factory?)