In my opinion Nissan Japan and Infiniti are the same. The engineering level is about the same. They just put more budget when building Infiniti.
So actually buying Nissan/Toyota Japan is very cost effective. Those cars are not expensive but engineering level is very high. But I'm very willing to pay more money to buy better cars like Infiniti/Lexus when I have the money.
I think I will not choose Lexus again until I'm 70.(if I'm still alive.)