I found the currrent IS (now fairly aged) to have the best interior in class in terms of driver's seat luxury, sportiness, and functionality on top of quality of materials. BMW took a nice step down on quality of materials in class with the f30 IMHO. The reason I never took a serious look at the IS was the joke of the backseat and the lack of a manual transmission.
Nonetheless, Lexus' 3.6 liter was always cream of the crop for n/a engines. Guess we'll see what they do here.
I find the exterior to be decent. I used to think the f30 front and rear ends were ugly; now I like the front and ignore the rear. I used to think the e60 was ugly. I used to think the "then new" Audi grill to be ugly on the a4 and a6. The new mercedes e-class front end? Used to be ugly to me...
I could go on. My point is simply that I no longer take my own initial reaction as something that's going to hold up.