with what you said about BMW selling more cars than Lexus could imagine, couldn't be further from the truth.
In the US (world's biggest market), lexus outsold bmw (even with their smaller range of vehicles)
now i agree that the 3-series saloon is the finest handling small saloon (but definitely not the 316 or 318, they're awful) but we're talking about the compact which is nowhere near as inspired a drive
the M5 is a fantastic car and even i wouldn't not buy that just to avoid a bmw, i definitely would buy it
but the IS is very very good and normal driving will not bring out the reasons why the 3-series is a better handler
the 3-series doesn't even look that special anymore, far too plain and uninspired
the IS still has that racing stance, the power bulge in the bonnet, aggressive bumpers
so to sum up, the IS handles almost as well as a 3, costs loads less, higher spec and looks so much more sporty
lexus customer care is far better
if you buy a bmw after all that, you are simply being a sheep, aren't you
if you don't mind my asking, why do you not like the IS so much, maybe if i knew i could understand more