That's the point. Man and gorilla have more similar genomes than man lemurs, who have more similar genomes than man and sharks, and man looks more like a gorilla than a lemur, and more like a lemur than a shark.
Interesting topic. You might agree: In the transition from prehuman apes to human apes, we see the foramen magnum, the hole in the skull through which the spinal cord passes, go from the occipital (posterior) position to the underside of the skull with the advent of bipedalism, the brow ridges flatten, the jutting forward of the lower face flattens as the muzzle disappears, the chin appears, and the teeth evolve - smaller canines, less enamel, and more vertical / less angled forward - to reflect the addition of meat to the diet and eventually the advent of fire. The cranial capacity more than triples as the low forehead became more human-like, the sagittal crests disappear, the temporal fossae - the depressions on the side of the upper skull - become shallower as jaw musculature diminishes, the shape of the cheeks (zygomatic arch) changes as the jaw musculature passing through diminishes, and the size of the lower jaw (mandible) diminishes as does the nuchal ridge in the lower back of the skull to which neck musculature attaches. There are also changes in the size of the ear holes, and the nose goes from flat to pointy during the transition from ancestral ape to modern man.
It might be difficult to decide which forms are ancestral rather than cousins, but man and gorilla definitely have common ancestors going back from where non-orangutan great apes (hominines - this week, anyway; the taxonomy is evolving) bifurcated into what would become gorillas from what would become man and chimps/bonobos (hominins) all the way back to the beginning of evolution. You and I have a last common ancestor, but it might be difficult to determine who that was. If you pick somebody, and we don't have an accurate genealogy, we can't know if either or both of us descended from that person or maybe form its sibling instead. But we know that such a person or couple must have existed. Likewise with the last common ancestor for any two clades.
