jack, i carry the sheepsfoot/pen combo in the 2013 forum knife (congress jack) almost every day. It's my preferred knife now. I have several of this combination on the congress frame, and the one gec made is by far my favorite, mainly due to the little things they did with this pattern. It's slimmer than most of the ones i have that are the same length (mainly fight'n rooster brand) due to the use of micarta scales (very thin), they set the blades fairly low, and the pen blade spacer is not full length (a nice touch rarely seen). A wharncliff would set the main blade down into the frame a little more, and i may modify one like that some day. But, overall, it's the combination of a good sized straight edge and a small pointy, curved, pen blade that i find useful.
I like the lambsfoot, but have a preference for slim knives with two blades, preferably one with a sharp point and one with a curved blade. to me the uses of a straight edge and that of a curved edge are different and complimentary, and too often a pointed blade is handy for general purposes. To that end i would probably carry last years forum knife if i wasn't already using something i prefer.
One thing that always amazes me is how often really well used knives have been sharpened to a straight, pointy, blade thru continuous use, no matter what the original shape was.