Here's how the G20 3 Series looks visually against the Lexus IS.
Also see:
G20 3 Series vs F30 3 Series Comparison
G20 3 Series vs 2019 C Class Comparison
G20 3 Series vs A4 S Line Comparison
Dimensions:
G20 length: 185.7 in
G20 width: 71.9 in
G20 height: 56.8 in
G20 wheelbase: 112.2 in
G20 front track: 62.3 in
G20 rear track: 62.9 in
IS length: 184.3 in
IS width: 71.3 in
IS height: 56.3 in
IS wheelbase: 110.2 in
IS front track: 60.4 in
IS rear track: 60.6