Atletico Madrid
Atletico saw off the might of Bayern Munich to top Group D and then enjoyed further success against German opponents by despatching Bayer Leverkusen over two legs in the last 16.
Leading scorer in this season's Champions League: Antoine Griezmann 4.
Best European Cup/Champions League performance: Finalists (2013/14).
Current domestic league position: 4th (LaLiga).
Barcelona
Largely untroubled in Group E, it was Barca's record-breaking heroics against Paris St Germain which will live longer in the memory, having overhauled a 4-0 first-leg deficit to advance to the quarter-finals 6-5 on aggregate.
Leading scorer in this season's Champions League: Lionel Messi 11.
Best European Cup/Champions League performance: Five-time winners (1991/92, 2005/06, 2008/09, 2010/11, 2014/15).
Current domestic league position: 2nd (LaLiga).
Bayern Munich
The Bundesliga champions more than made up for a group stage runners-up finish to Atletico by twice firing five past troubled Arsenal to run out handsome 10-2 aggregate winners in the last 16.
Leading scorer in this season's Champions League: Robert Lewandowski 7.
Best European Cup/Champions League performance: Five-time winners (1973/74, 1974/75, 1975/76, 2000/01, 2012/13).
Current domestic league position: 1st (Bundesliga).
Borussia Dortmund
Unbeaten in Group F, pushing European giants Real Madrid into second spot, Borussia then overturned a first-leg disadvantage against Benfica with a rousing 4-0 display - including a Pierre-Emerick Aubayemang hat-trick - to ensure safe passage.
Leading scorer in this season's Champions League: Pierre-Emerick Aubameyang 7.
Best European Cup/Champions League performance: Winners (1996/97).
Current domestic league position: 3rd (Bundesliga).
Juventus
Another unbeaten side in the group stage, the Serie A leaders slipped almost unnoticed into the quarter-finals for the 10th time in their history with a trouble-free 3-0 aggregate win against Porto.
Leading scorer in this season's Champions League: Gonzalo Higuain 3.
Best European Cup/Champions League performance: Two-time winners (1984/85, 1995/96).
Current domestic league position: 1st (Serie A).
Leicester City
Competition debutants Leicester defied the odds and the critics to despatch Sevilla in the last 16, winning the return leg 2-0 and the tie 3-2. This season's surprise package, despite a terrible domestic season and a recent change of manager.
Leading scorer in this season's Champions League: Riyad Mahrez 4.
Best European Cup/Champions League performance: No previous appearances.
Current domestic league position: 15th (Premier League).
AS Monaco
The free-scoring French League side finished top of their group and overturned a first-leg deficit to upset Manchester City and book a place in the last eight.
Leading scorer in this season's Champions League: Radamel Falcao 6.
Best European Cup/Champions League performance: Finalists (2003/04).
Current domestic league position: 1st (Ligue 1).
Real Madrid
Record European champions Real proved their group stage runners-up finish was merely a blip by hammering Napoli 6-2 on aggregate to reach the quarter-finals for the seventh successive season.
Leading scorer in this season's Champions League: Karim Benzema 5.
Best European Cup/Champions League performance: 11-time winners (1955/56, 1956/57, 1957/58, 1958/59, 1959/60, 1965/66, 1997/98, 1999/00, 2001/02, 2013/14, 2015/16).
Current domestic league position: 1st (LaLiga).
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Source: PA-WIRE