I think most would say that the 747 series has been far more successful and managed to "do more" for the int'l traveling public... but I do agree that the L1011 was a great plane... still is, actually ! In terms of my own personal experience and comfort... two long-hauls come to mind...
A flight from ATL
on a 744....
A flight from PDX
in Oregon to Bangkok, Thailand on Delta in the early 90's, via Seoul.... on an L1011..
Both in economy coach. The L1011 flight was far more comfortable....
coach seating in the 744 next to the window for nearly 20 hours on-board with a head cold from JNB
was the most awful flying experience I have ever had.