Hi
That's exactly what I did (I used to drive an A5).
I've gone for the F sport (in blue) and yeah had two months now and am not disappointed in the slightest - it gets a lot of looks :-)
My issue is I have gone for the premium Nav system and Lexus had to get one of their customers to get it working for me, additionally I have a Samsung S5 and the phone connects but it will not download messages.
So my advice - go for the car but prepare yourself for possibly some software issues.