Personally, I think a lot of those advantages are more preferences. "Value per channel"? If by value you mean dollars, OK. I would rather have the analog pres, though, even if they cost more. I couldn't care less about poly WAV; I find it to be the most convenient format for archiving my original files and it is seconds of work to get it into any other format. I also prefer the UI on the MixPre; the very responsive touchscreen makes it super easy to navigate quickly and I find it to be well-organized.
To me the only real advantage of the F series is that battery life is better, but that is the necessary trade-off for analog pres, (adjustable) limiters, and (adjustable) low-cut filters. I prefer the build quality of the SDs, how the shape fits my bag, and the much better mic input (lower minimum gain, higher max input). Sound Devices also has excellent customer service, with repair facilities in the US and Europe. Although I don't have much use for it, I would even suspect a better implementation of 32-bit float, based on their patent, which implies three ADCs and a novel algorithm for combining the streams.
Pretty much a personal choice based on what a given individual finds most/least important in a recorder...