Ingemar, I've also seen a test in a Dutch magazine where they tested the 28-70 AF
-S and 80-200 AF
-S against the Tamron 28-200 Mk II
The Tamron came out on top by a wide margin...
The reasoning was simple: the Tamron is cheaper, lighter, and smaller, and you never have to switch lenses.
The optics were never taken into consideration at all.
That same issue had 2 fullpage ads for Tamron, they'd not carried a single ad of any size for Nikon in almost a year.
Not saying the Tokina isn't a good lens, but I've seen enough incredibly bad reviews to not place much confidence in them.
For wideangles especially I'd always go for Nikon. They are the kings in wideangle lens design.
Tokina are probably good seconds, a group of Nikon lens designers leaving the company to start their own must have some expertise