No! I've driven both. In owned a number of infinities, six actually.

And it is nowhere as quiet or advanced as the K900. Even its Q70 form. I really was attracted to the Q70L long body until I drove it on the freeway. It was so **** noisy. I drove two different Q70L's so I think I know what they're like. The 3.7 V6 works really hard when you ask it to accelerate.