I really hope Infiniti will not get too greedy and price the Q50 400 HP $10K+ lower than 340s & C450s to give us a more affordable performance luxury car.
Based on what I see in my FCG very friendly neighborhood, high end of the compact German cars have become halo cars, never mind their top hot rod versions. I have yet to see a 340; 335s are quite rare considering how long it has been on the market and how many 328s and especially 320s are rooming the streets. I only saw two C400s so far. A4 represent the better value IMO and they are omnipresent although the high end trim is a rare sight.
Profit margins are so high on the more pedestrian models that BMW and M.-B. don't really care selling their sportier models anymore.