I recently purchased a farmer and have been carrying it everyday. I've owned a soldier and pioneer for years. To properly respond to this question I've got a farmer and soldier setting side by side on my desk at the moment. The farmer is definitely thicker due to the saw, but they both feel just fine in the pocket. To be honest, I think that the farmer feels better in the hand due to the extra thickness.
If I could only buy one, I'd get the farmer.
As far as the saw goes, I've used it to saw small branches (1 - 2" in diameter) with no difficulty. I've used it to saw larger pieces as well (small firewood roughly 3" in diameter), but generally try to only saw about half way through then break the wood in half. The saw works great but it's not designed to clear cut a forest of course....great for small limbs, drywall, cutting notches in various materials, etc. As far as everyday general carry, the farmer does an outstanding job. I imagine the farmer teamed with a decent fixed blade / hatchet would cover most outdoor needs as well. (At least in my neck of the woods in North Carolina)