i recently flew on a 752 on BF (from EWR-TPA funnily enough, checked the status and it was hopping from LHR-EWR-TPA which i found interesting).
got an EUA and was put on 2F. i liked it. the seats are nice, however they definitely were more narrow than i had expected. that barely even registers as a complaint in my eyes since i'm not particularly wide, but it's something that i definitely noticed. i think even the F seats on a 739 are wider.
the one thing that did bother me though is the footwell. i think it was partially because it was the window seat, but the footwell was really, really small. i wear 10.5's and when i tried to put both feet fully into the footwell, it didn't really fit and got uncomfortable. also when i went 180 and tried to lie down... i'm exactly 6'0" and my feet were cramped in the footwell and my head was only a couple inches from the back wall. sleeping with an arm near my head or anything like that wasn't going to fly with that.
don't get me wrong, it's still a comfortable seat and beats the heck out of coach. but as my first CO BF seat ever... well... i had grander dreams.
i'm flying my first 772 BF lie flat in a couple weeks though to asia, and i think the extra inch in width and, more importantly, the extra 2" in pitch might do the trick for me though.