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Ride quality between the M4 and M6 should be about the same. Both cars has the rear subframe and diff directly bolted on to increase torsional rigidity and stiffness.
General ride quality usually is determined by your tirewall height and wheel size. The M6 GC you rode in has a 20 inch wheel on a 30/35 tire. The M4 could have been on wheel sizes of 18, 19 or 20 with tire heights of 40, 35 or 30.
On M cars, there is also dampening speed adjustments you can make to the shocks (EDC). So the M6 could have been on "comfort" and M4 could have been on "Sport or Sport+"
I think spring and shock dampening will be the final factor of ride quality.
All said, I too agree that the M6 is much more comfortable ride on the street than my old E90 M3, on the same EDC setting. However, I actually think the Sport setting on the M6 is already too harsh, maybe I'm just getting old.
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