When I first started doing uoa's, I made the mistake of trying to compare an oil based on 1 or 2 uoa's. You will see many people make the same mistake and you simply cannot judge an oil based on one or two uoa's.
I always like to link this article on bitog that was not written by a plastic surgeon, but by someone that has carried out hundreds of uoa's and has consulted and worked with various oil companies.
http://www.bobistheoilguy.com/used-oil-analysis/
He emphasizes that most of these random uoa's are more useful for determining the
condition of the lubricant, but not a measurement of actual engine wear.
And here's a good article about why high iron uoa numbers isn't necessarily a good indicator of wear.
http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/2065149/1/Why_iron_ppm_numbers_are_NOT_g
-Dennis