Ok fair, enough. So this should level the playing feel (comparing production models)
ASH said:
...4ser is almost the size of the previous gen. 6ser.
This is true.
4 Series:
Wheelbase - 2,810 mm (110.6 in)
Length - 4,641 mm (182.7 in)
Width - 1,826 mm (71.9 in)
Height - 1,362 mm (53.6 in)
E63/E64 6 Series:
Wheelbase - 2,778 mm (109.4 in)
Length - 4,831 mm (190.2 in)
Width - 1,855 mm (73.0 in)
Height - 1,373 mm (54.1 in)
Only marginally shorter, narrower and lower than the 6-series, though the wheelbase is tad longer.
That being said, the F30 is almost the same size as the E39, and likewise the the F10 is almost the same size as the E38.