Actually, that came up in a discussion I had with someone else about the difference and I agree. With CLAMP's work these days (save Code Geass, and their designs got considerably altered between the sketches they did and the final animation style used by the studio, so I'll forgive it), everything is elongated. Necks, torsos, hands, legs, feet, arms. All of it. It still looks awkward and noodley, but it somewhat works because everything is still proportionate to each other, just massively exaggerated. Whereas in the Liefeld piece, you have a warped, squished up torso, a regular-length neck, regular arms, tiny hands, and... those legs.