I have it on my B7. It's only noticeable on certain specific content (very low brightness gray basically). Mines gotten a bit better since I've owned the TV.How many folks with the B/C7 are experiencing banding issues then? Might just try and learn to live with mine, but it's definitely frustrating :(
From what I've seen it's worse on average for the 65" model compared to the 55". I don't think I've seen photos of one without it, but some definitely are better than others (mostly 55") and may not be noticeable even in demanding content. That being said, there's no perfect TV tech out there. Everything has quirks. OLED looks sooo damn good that I don't mind the minor imperfections.