Blade length: the 16 is almost an inch shorter, its shorter overall too
Thickness: massive difference, the BK2 is 1/4 inch thick !
The 16 full flat ground, while the 2 has a flat grind that doesn't go all the way up to the spine
The 17 is basically the 16, but with a clip point.
Is it a good knife ? I only own the 14 so far, but from what I've seen, there ain't a single bad knife in the Becker lineup :thumbup: