I've not revved my car much to notice harshness (1800 mi. so far), but I notice a hint of it compared to my VQ35DE. Engine sound of the VHR seem to be more relaxed at 4k, which is like 3k in the DE (it gets angry quicker). From watching the Genesis 3.8 videos, the VQ definitely lost some smoothness.
What I really like about the VQ37 is the lower engine note that compliments the higher note of the exhaust sound. With the VQ35, that lower engine note is not present.
Overall... love it!
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