I think you will find that quite a few Infiniti fans, are former BMW loyalists.
I myself used to drive an older BMW 528 and had been looking at a newer one, when I bought my first Infiniti (used Q45).
I found that for less money I got a newer car, with a bigger engine, more room, more features equivalent handlung and better braking (comparing an early 90's Q45 to a early 90's 7 series).
Both are expensive to maintain (by most ppl's standards).You will hear more moaning about that, on an Infiniti board, becasue BMW owners generally tolerate that better and there is a bit of an expectation of this with a german car vs a japanese one.
I think BMW still has an edge in ergonomics, handling (this edge is eroding fast and only applies to select models anymore), street cred,exterior design, resale value. When buying a new or newer Infinit you get:
- a better warranty
- significantly better build qualit(Infiniti beat Lexus in the latest JD Powers initial build quality report) and we all know about BMW latest quality issues.
- more engine than you would get in an equivalent BMW model. (for example for the price of a new 530 you can buy an M45 w/ a 32 valve V8 w/ VVT and 340hp!)
- better braking (if looking at G35, otherwise equivalent braking)
- much better service departments (driving a 10 year old Q45, I get better service, respect and follow up, at my dealer, than I have observed the owners of brand new 3 series getting at a BMW dealer) Infiniti customers as a whole, are pretty pampered when it comes to service, and have come to expect the best (horror stories still exist as they do with any brand).
Hope these musings help and I also hope my enthusiams for our marque, wasn't too denigrating to another great marque.
Fred...