Between the newest versions both the kw and ZF are high quality replicas with various flaws. To my untrained eyes, KW seems to have the more accurate brownish bezel (compared to the more maroonish ZF bezel), while ZF appears to have sharper dial font. IMO the dial color isn't dark enough on either of them except in certain lights.
All in all, both are very good watches, but neither will pass for the real thing next the gen article. Not quite the super rep as the other black bay options, but others might have a different opinion.
