Interesting that BA planned a 200-seat 'economy' config for the B752 (post #71). Most charter operators squeezed in 235 seats. I once asked a Boeing engineer looking into condensation problems on our fleet whether the extra pax breathing out moist air had anything to do with the problem. His response: 'It has everything to do with the problem.'
The 757 was pleasant enough to fly although most dual-rated pilots preferred the 767. The 75's speedbrake wasn't too effective. Some cynics said pulling the lever activated an 'airframe buffet' device to con you into thinking you were getting a response of some sort.