In addition to 5er GT and CS, E89 Z4 front end is one of the best so far, or BMW could use F01 7er M-Sport Package bumper. The front bumper crease flows better with fold shown in in this thread:
http://www.7post.com/forums/showthread.php?t=323523
F01 3/4 perspective:
F01 Straight-on from side profile: