Much has been made of the tiny new Sigma fp, officially the world’s smallest full-frame mirrorless camera as of this writing. But just how small is this thing compared to the competition from Sony, Nikon, Canon and fellow L-Mount Alliance member Panasonic? Thanks to the folks at Camera Size, who have already added the Sigma fp and compatible L-mount lenses to their directory, we now can. Here are a two angles comparing the Sigma against the Sony a7III, Nikon Z6,…