JC Koto,
I'm not sure how the foot box relates to comfort, I'm normally sprawled all over with my feet outside the bag. Personally, I would hesitate purchasing any sleeping bag with more filling on one side vs the other because I normally sleep with the bag unzipped as a blanket. I only zip up on the coldest of nights, while in a fetal position....ha As far as temperature ratings go - I have a 40 degree down bag that weighs just over one pound. It stuffs in the factory sack to less than the size of a 1/2 gallon milk carton, (I would not use a compression stuff sack on my down bags.) I slept in it last night at 24 degrees F. I wore lightweight long underwear(top & bottom) and a very thin pile top and bottom over that, no socks or hat. I zipped up, stayed warm, slept well and will do it again tonight. The tent design kept me dry from the condensate, now it's damp and will dry by tonight. The windchill was 16 but I was in a tent so it didn't matter. This was an overnight outing just to test the bag and clothing combination for my own information. If you don't like sleeping in clothes - a guy obviously needs a bigger bag.

Indeed, my experience is that Synthetic bags retain loft better when damp or moist. In my previous post, I was trying to make a point about what they do when wet. Dampness is a comfort issue to me. I guess I've learned to compensate for the damp feeling of either type of bag with wool underwear, in summer as well as winter. I try to carry three sets of clothing for wet weather - one drying, one on/wearing, one hopefully dry. These are important issues to consider.