The Kii’s use inexpensive drivers according to diyAudio (Peerless $20 x 4, Dayton $16 and Seas $74) but do rely on sophisticated DSP techniques
This is typical even for 10K speakers. A 2K speaker may have even less expensive drivers. That the Kiis with these drivers and DSP came close to B&W 802 D3S does not reflect well on B&W. B&W tend to use small 1 1/4 inch diameter long voice coils similar to the Kiis even if their cone materials are more advanced.
So the answer really depends on driver quality rather than price.
Exceptional drivers with large diameter short voice coil operating in a large gap with extreme tight tolerances will easily outperform cheap drivers with DSP. These kind of drivers cost at least $200 each for a low cost version but can be as much as $1K -$2K each.
So if the 50K speaker has drivers that are commensurate with that price (rather than just expensive cosmetics - veneers can be exceedingly expensive), then the drivers alone could cost double the price of the entire 2K speaker and will outperform in power/dynamics/precision much in the same way an Audi R8 will destroy a Toyota Camry.