in sport+ mode, the 7AT on the Q50RS does respond and shift slightly better, but agreed its time to replace. I think a bigger issue is no LSD and the factory run flats. AWD helps make up the shortfalls, but its still rwd-biased awd. Decent tires help considerably.
the 1st/2nd gen G35/7's were more connected to the road vs. the Q50, hands down. Q50s lost hydraulic steering and factory LSD. I do miss that from my old G35.
I wish Infiniti would put an LSD (or eLSD) in the Q50/Q60 and some good tires like Pilot P4S's. They definitely softened up the suspension in the Q and it lost some of it's drivers car attributes. I always though of the G37 as the Japanese version of the three series.
Also, Infiniti is a bit behind competitors in their infotainment. Simple things like upgrading the screen resolution and adding Carplay would be nice. Also, a digital dash would be cool.
Overall, I feel like Infiniti is a lost brand. The changes I outlined above will likely keep me from buying another.