In short, the answers for both me and my wife is NO!!! In fact we both drove that car and what a disappointed for me and my wife... I will tell you why in later posts...
Actually my GSF is VERY GOOD and a little too good to be true...
I think the best part of my GSF is extremely stiff unit body which creates totally different level of steering and handling on mountain roads even though its springs and dampers are less stiff than that M4...
M5(F10) is more stable than my GSF but my GSF is more stable than M4...
But, my GSF is more nimble than M5 and almost as nimble as M4 (again even though its springs and dampers are less stiff than that M4...)
Due to less stiff springs and dampers GSF may have a little delay INITIALLY than M4 when turning... However once GSF's springs are compressed... Wow!!! That solid feel is so good and that M4 never has...
That's why I keep saying... It's really strange!!! My GSF is much softer than my previous modified G35S but why my GSF feels better on curvy roads and feels not so good on straight roads???
Now I think I finally found the answer... Which is very stiff body + softer springs...
Don't get me wrong... My GSF springs are still as stiff as those in M5. They're just much softer than PSS10, KW V3 in G35S and somewhat softer than those in M4...
I think the unit body of M4 may be a little better than IS... Actually I'm not really sure because M4 comes with stiffer springs and much stiff dampers than IS... If it is, I think the difference is not much... But my GSF is totally on different level...
My wife also said those seats in M4 hurt her coccyx bone (尾椎) in 30 minutes... I also agree...
Yes. Those seats were quite stiff and uncomfortable... Not only my GSF has much better and comfortable seats, they also secure your body MUCH better!!! I think my previous 2007 G35S has the most stiff seats among all my cars but the seats in M4 were even MUCH stiffer...
PS: The seats in recent Q50S are much more comfortable than my previous G now...