Pure theoretical question. If we discard both Z5800 problems with sound and Philips 9664 Ambilight feature and start judging both sets on the basis of their pure picture performance ( movies and sports) which would be your preferred choice? We did not have online review of Z5800 posted yet, but probably there were enough people who already took a look at both sets and formed their opinion. There was head-to-head comparison of 9704 vs Z5800 in the german audiovision site, where Sony came on top despite having a bit lesser ANSI contrast and 9 times worse blacks. And 9664 is not as good as 9704 in both areas. Though everything is the eye of the beholder. Would be interesting to here where community stands on the subject.