I don't own one of these. However, having owned one of the previous legacy lm big boys .
After viewing videos of the Lionchief bigboy on line. The nit I would pick is that it only has 4 chuffs per revolution. The previous legacy runs had the more prototypical 8 chuffs.
Outside of that. It shares much of the the soundset with the vl bigboy, aside from my "nit" . It sounds fantastic.