Hmm...all 747s, except RP-C8168 (which is supposedly being refurbished), don't have F. But at any rate, if you can't decide, you can always use PAL's virtual cabin tour for the 747. (Take note that the virtual tour applies to RP-C7471, 7472 and 7473. RP-C7475 has a different layout, with middle seats.)
*Mabuhay Class main deck:
http://www.philippineairlines.com/pr..._lowerdeck.jsp
*Mabuhay Class upper deck:
http://www.philippineairlines.com/pr..._upperdeck.jsp