I dunno, the review looked pretty good to me. He doesn't specifically 'rank' it, but he mentioned it was one of the best viewing experiences he has had. I think a ranking is harder when there is no set to directly compare it to (all are smaller and cheaper). He basically raved about all HD material, but he does certainly seem to state the kuro is still better. The conclusion also mentioned no serious weaknesses at all.
With regards to the any shortcomings, he mentioned he was 'splitting hairs' quite a bit, which i guess he had to do because of the price tag. But a top-of-class 65 inch set is not going to be cheap, as all the expensive components that make the best PQ must be spread out over 65 inches. I expect the price delta will be smaller for the 50 inch size. Although that set may have little purpose if the 50 inch kuro outperforms it, even marginally.
So this set does certainly have a market who would find the 60 inch pro-151 too small and are not willing to wait to see what mid-late 2009 brings. Panasonic will probably sell a bunch of these to broadcast studios and large-scale commercial applications with cash to burn as well. Their industrial line has always sold well in these areas.