I like big juicy carp lips and I cannot lie.
Not all carp lips are created equally though. Or are they? I have this crack-pot theory. I think that carp lips are like calluses. The more often and harder a carp grubs on the bottom the bigger the lips get. If that is true then you can gauge some of the feeding habits of a body of water by the lips. In our local river you will catch many carp with small lips. Stillwater fish almost always have big juicy Angelina Joline (post silicone) lips. I think this relates to how they feed.
Both of the carp I caught today were lip challenged. The first one had lips so small it's mouth looked more like a bonefish than a carp (based on pictures not personal experience). It was actually harder than usual to get the fly out because it was embedded in cartilage deep in the corner rather than rubbery lip.
This fish lives in a spot where he/she probably spends significant time feeding in light to moderate current. In case you haven't fished light to moderate current for carp the tailing just is not the same. You will rarely find a fish sitting in one spot with it's butt in the air grinding his or her face into the bottom. The hydrodynamics just doesn't work out. You are more likely to see carp hanging just off the bottom hanging in the current and waiting for food to come to them or moving ever so slowly up-river and briefly dipping their heads for a juicy morsel drifting along. That is what the next carp I caught today was doing. Once again minimal lippage. It's my theory, I am sticking with it.
And that brings us to another difference between stillwater and river fish. A stillwater fish of this length would probably go 14 to 15 pounds if it was lucky but these river fish are shaped like footballs. This fish scaled in at 17lb and was massively strong. All that current builds girth!