one person's definition of a perfect chef knife is heavily dependent on what's one is exposed to.
if you're used to western knives, that would already split you into two categories.
the german profile which has more belly and the french profile which has a flatter belly.
and then when you get into asian versions of the chef knife, you'll find the chinese vegetable cleaver, the japanese gyuto (yo or western handle and the wa or traditional japanese handle), and the funky people who consider santoku's as the japanese version of a chef knife.....
with the japanese gyuto, there's going to be a debate yet again on which is better, with bolster or western handle or the wa handle. then there's thickness of the spine and behind the edge, lasers super thin and super light and slightly beefier (but still thinner than true western chef knives) versions......
what a can of beans.