While I agree with swamp that it not close to the M3 does it really have to be?
We already have an M3 and we surely don't need a carbon copy, there is many ways to skin a cat and when you look at both the RS4 and C63 you see totally different product competing in the same market place. I don't know about you but if I didn't like how the M3 drove then I would hardly be considering the IS-F it is was something the same.
For me I am expecting the Lexus to offer a smooth and polished interpretation of a hi-performance saloon with a touch of luxury that the other seem to shy away from. It's take the position that Mercedes use to occupy with the C32 and C55.
Would I buy it? No because I am happy with the M3 but I don't doubt it will get some very satisfied customers.