I've got a couple of older Series F cables and was surprised that my latest order for Series FE was a little thinner and more flexible. I thought they were both the second tier offering from BJC but wasn't able to dig up info on the Series F.
BTW, my TV has a known issue with something they call floating brightness(FB) IIRC. I was interested in seeing if there was an improvement by swapping out a cheapie HDMI from my cable box. The FB isn't nearly as noticeable from an Oppo BR player. Once again the subjectivist states from his back foot, "my g/f could see the improvement."