Even looking at the so called Carl Zeiss engineered lenses (16-86 and 24-70 (??) both have very soft images and other optical problems and are clearly several steps behind the competition.
well, that site (whichever it is as slrgear haven't tested it) is clearly out of the ordinary then as e.g. the 24-70mm ZA is reckoned to be the best of the 3 (Sony, CaNikon) by every other review that I've seen ...
Looking at slrgear's conclusion of the 70-200mm
"There can be no argument that in the Sony alpha lens lineup, the 70-200mm is a lens of the highest quality, offering superb results. "
"This one criticism aside, it doesn't get much better than this".
Doesn't exactly sound bad & they even mentioned that they may not have got the best sample ...
They didn't even get the price right (they said $2000, the list price is $1800 which under Sony SURE programme in the US dealers can't
advertise lower than that although that doesn't mean that they can't
sell lower than that - they've been selling for as low as $1200 recently.).
The CaNikon's aren't perfect either as you can see from DPReviews recent tests.
At this level they are all excellent though so we are really scraping the barrel to find differences.