That's what I thought about QS10 vs. QS8 and I am soooooo glad I traded in my QS8.

I can tell you the M3v4 is very different from M3v3. Whether or not you'll hear a significant difference in surround duty is unknown to me. And I don't know how different the v4 M22 is compared to the v3.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated