The E coupe and A5, will be up against the new 3, oh sorry, 4 serie's coupe.
Not the 6.
In the 6 class, that's where CLS and the fugly A7 is.
Compare apple to apple, not choose randomly from cars who belongs to another class, both size and regarding $ imo.
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3 series: E30: 89 325i, E36: 92 325iC, 94 320iC, 96 320i Convertible, 94 320iaC, E46: 99 320ia, E90: 06 318i Le mans, E91: 07 318dt
5 series: E39: 97 520ia, 01 530Dat, E61: 09 520Dat
X series: E83 05 X3 2.0d, E84 10' X1 2.0 X-drive DA, F25 13' 2.0da X-drive.