I believe, currently, the domestic market 747's in Japan carry the most passengers. In their high density configuration, they carry about 520 pax. That is, until the A380 begins revenue service. Currently the A380 is configured to carry 555 pax, but in a high density config, can carry over 800. But, as we all know, it has yet to carry one paying passenger.
For the rest of your info, just click on the A/C data link at the top of this page and you will find all the info you need.
My glass is neither 1/2 empty nor 1/2 full, rather, the glass itself is twice as big as it should be.