wah.. no nid to debate la..
just search for reviews...

I dun remember seeing any shootout btw n73 and k800

but N80 vs K800 got la....
i guess its both 3.2mp and both carl zeiss(dunno if the quality of the CMOS is diff though for lower end phone... but still a starting point)
http://www.gsmarena.com/3mp_test_nokia_n80...0-review-79.php