roger_h,
http://www.uefa.comhttp://www.xs4all.nl/~kassiesa/bert/uefa/index.htmI did some search and there are actual cases where 7 points gives you 2nd place finish:
1999-2000 (1st group stage)
Group A ----- Pld W D L GF GA Pts
Lazio --------- 6 4 2 0 13 3 14
Bay. Leverkusen 6 1 4 1 7 7 7
Dynamo Kyiv --- 6 2 1 3 8 8 7
Maribor ------- 6 1 1 4 2 12 4
1995-1996 (group stage)
Group B ----- Pld W D L GF GA Pts
Spartak Moscow 6 6 0 0 15 4 18
Legia -------- 6 2 1 3 5 8 7
Rosenborg ---- 6 2 0 4 11 16 6
Blackburn ---- 6 1 1 4 5 8 4
However if say Liverpool beat Roma and then Barca drawn with Gala then 7 points will be enough to win the group and THAT has never happened before : the closest in the history of Champions League is 8 points.
1998-1999 (group stage)
Group B ------ Pld W D L GF GA Pts
Galatasaray --- 6 2 2 2 8 8 8
Juventus ------ 6 1 5 0 7 5 8
Rosenborg ----- 6 2 2 2 7 8 8
Athletic Bilbao 6 1 3 2 5 6 6
So history is in the making......